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II. The mid-brain or mesencephalon extends from the posterior boundary of the mesencephalon insensibly into the spinal cord.

...as to the front of the infundibulum, which occupies a position beneath the mesencephalon, the thalamus having been caudo-ventrally appressed upon the corpora quadri ...ian length being much greater than that of cerebrum. The ventricles of the mesencephalon are large and extend far laterad, while the tectum is highly developed.

c. The mesencephalon with its cavity, mesocoele ; sections farther cephalad show the junction of c. The kilos, the tela, the cestus, and a mesal transitory sulcus in the mesencephalon.

...ce of definite terminations, though the fascicles reaclj backward into the mesencephalon (hypothalamus and interpeduncular region), a condition not yet noted in oth

...tion of the corpora quadrigemina. In Mrs. Gage's case this division of the mesencephalon is much more marked.

...tly compressed opposite the posterior commissure. In the blind Proteus the mesencephalon is smaller than the ...Anura, owing to the large optic nerve nuclei. The size of the roof of the mesencephalon is in direct proportion to the functional perfection of the eyes. The cereb

the posterior end of the infundibulum lies the mesencephalon prosencephalon and thick walled mesencephalon, but the paraphysis is not present and appears first in an embryo of 11 5 m

...l ends, where the cranial and caudal neuroporic apertures are present. The mesencephalon is flexed upon itself, in such a way as to bring the prosencephalon almost

...ponding to the fields, with indications of the telecephalon, diencephalon, mesencephalon and myelencephalon. (From Lehmann 1948.)

Mesencephalon 51 ...in plates 1 and 4, By the cephalic flexure (Flexxeph.) which occurs in the mesencephalon (Mesen.) the fore-brain is bent at an acute angle to the hindbrain. The cer

head bend occurs in a part of the tube called the mid-brain (mesencephalon). isthmus. The mesencephalon remains undivided; the fore-brain is represented by the diencephalon poster

...12, 13, 17). Part of its medial wall is fused with the lateral wall of the mesencephalon, but its anterior end is free (figs. 21, 22). The roof of each lateral rece ...essus lateralis into the region of fusion between the diverticulum and the mesencephalon (figs. 4, 5, 23) . The medullated fibers of the cerebellum accumulate chief

...al hfe, and its significance as a measure of growth of that portion of the mesencephalon below the iter is particularly questionable. In some fetuses of three to fo

...ce of definite terminations, though the fascicles reaclj backward into the mesencephalon (hypothalamus and interpeduncular region), a condition not yet noted in oth ...nd, Held claims that the mesencephalic root takes origin from cells in the mesencephalon and from the locus coeruleus. Bregmann states that a lesion of the motor po

...of of the diencephalon. Between ^ and ^ of the roof between the pineal and mesencephalon is occupied by the post-commissure. The remaining portion is precisely simi The dorsal roofs of the mesencephalon, diencephalon and primary prosencephalon are approximately equal in extent

...MENTUM, PULVINAR, FALX, TENTORIUM, THALAMUS, CALLOSUM, STRIATUM, DENTATUM, MESENCEPHALON, PALLIUM, OLIVA, CLAVA, OPERCULUM, FISSURA CENTRALIS (for /. Rolaudo, etc.) ...cm. media, and cm. posterior distinguish members of a conventional series. Mesencephalon, prosencepJiakvi and nietencephalon designate members of a natural series,

...cup-shaped nucleus, there were no efferent fibres to the cortex nor to the mesencephalon; that the efferent fibres all ran to the other nuclei of the thalamus, ...1.8 mm. A gi'oove marks the limit between the prosencephalon, P., and the mesencephalon, M. The stalk of the optic vesicle appears on the lateral aspect of the pro

...rward, but they extend backward so as to hide the thalamencephalon and the mesencephalon in a dorsal view, and even project beyond the cerebellum in Man (fig. 109) Mesencephalon

...pophysis (posterior lobe) ; isth., isthmus; med., medulla oblongata; mes., mesencephalon; ol. b., olfactory bulb; o. r., optic recess; p., pons; p. b., pineal body; Mesencephalon. The mid-brain remains undivided, and its walls become very thick. Dorsally

Chapter III. The Mid-brain, Mesencephalon 53 ...arther backward, certainly not as far as the extreme posterior part of the mesencephalon, and mdeed it seems very improbable that they should go so far backward. It

M., mesencephalon The mesencephalon 221

...o primary right and left halves, a floor-plate is lacking, as such, in the mesencephalon and diencephalon. The floor-plate would then be recognized as extending thr ...divided the brain into epichordal and prechordal parts, ^ but includes the mesencephalon in the epichordal brain, and the reason for this is obvious; to the midbrai

mes., mesencephalon Fig. 1 Dorsal view of mesencephalon, cerebellum, and medulla oblongata of Amblystoma punctatum.

Fig. 7. Section through the mesencephalon at the posterior commissure and hippocampus. C. — HiSTOLOdV OF THE DiENCEPHALON AND MESENCEPHALON.

...nt of the trabecula «lying upon each side beneath the thalamencephalon and mesencephalon. At its front end the trabeeula rapidly extends dorsalwards to form a verti

...mir untersuchten Embryo in drei Abschnitte teilen, das Prosencephalon, das Mesencephalon und das Rhombencephalon.

three nerve cells (A and B from the telencephalon, and C from the mesencephalon of a bony and the mesencephalon {Ariens Kappers, ’07, ’08a, ’20) indicate that changes in

The oculomotor nerve emerges from the wall of the mesencephalon by several slender rootlets arranged in a longitudinal series (fig. 4, Oc). ...s of medullary origin which have wandered out from the mantle layer in the mesencephalon can not be doubted. They can not be traced from any other source. My observ

...and the vesicle is wedged in between the walls of the thalamencephalon and mesencephalon at some distance beneath the integument. It lies posterior to the superior ...duced to a solid mass of cells, wedged in between the thalamencephalon and mesencephalon, and entirely without connection with any surrounding structure.

c. The mesencephalon with its cavity, mesocoele ; sections farther cephalad show the junction of c. The kilos, the tela, the cestus, and a mesal transitory sulcus in the mesencephalon.

...hether oinot Polistotrema has a cerebellum. If the jiosterior lobes of the mesencephalon should in the light of future investigation turn out to be a cerebellum, th ...olls' sinus mesocoelicus (fig. 63, S.M.) mark the boundry line between the mesencephalon and the metencephalon, and to regard his isthmic and ventricular canals (fi

...pophysis (posterior lobe) ; isth., isthmus; med., medulla oblongata; mes., mesencephalon; ol. b., olfactory bulb; o. r., optic recess; p., pons; p. b., pineal body; Mesencephalon. The mid-brain remains undivided, and its walls

Study of the effect of the removal of the anlage of the rhombo mesencephalon on morphogenesis and histogenesis of the extrinric eye muscles. Chick. Ilia L. Study of the effect of the removal of the anlage of the rhombo-mesencephalon on morphogenesis and histogenesis of the extrinsic eye muscles. Chick.

...ars later the epiphysis. The other two (iv and v) obviously enter into the mesencephalon. In selachians these two segments have connected with them respectively the Herrick's revision of the nomenclature of the diencephalon and mesencephalon contains two new terms, ophthalmencephalon, and medithalamus. As a pedogogi

...the optic lobes. The bridge, by a transverse fold, forms the limits of the mesencephalon and bends posteriorly in the form of a cornet-like projection. In six to se ...oad that part of the medullary tube which lies immediately in front of the mesencephalon closes last and remains in connection with the epidermis by a short solid b

Mesencephalon ...the colliculi and the retarded development of the peduncular portion, the mesencephalon is V-shaped as regards its ventral aspect, as well as its cephalic boundary

...He further states that transverse divisions, such as the diencephalon and mesencephalon, are not ' natural regions' because the primary metamerism has ceased to be ...ds between the fourth and third ventricles, "and Bensley ('10) writes: The mesencephalon is noteworthy in a mammal as lacking a ventricle. Its cavity is a narrow ca

...ius, which probably belongs morphologically with the pars ventralis of the mesencephalon . ...the body of this memoir I would modify Johnston's suggestions as follows: Mesencephalon

...rounds, there seems no sufficient reason to ignore the independence of the mesencephalon and to include it with the cerebrum. It is to be regretted that Dr. Hardest 4. Lemniscus system, mesencephalon and diencephalon.

The continuation of the cochlear conduction path into the mesencephalon by way of the lateral lemniscus appears in the opossum as a dense mass of f ...('01) for the human brain in her general reconstruction of the medulla and mesencephalon of the new-born child. As a guide to the present work the following brief r

The nerve arises from the constriction that separates mesencephalon and thalamencephalon. As the term " mesoccphalic " has been applied by Bear ...alk, arising now as a differentiated nerve from the depression between the mesencephalon and thalamencephalon, it passes down the sides of the brain, and is lost in

...hem, anticipate the more complex structure of the Anura. In the latter the mesencephalon assumes a bilobular structure and forms a prominent portion of the brain. P ...this narrow territory and the central canal contained in it is derived the mesencephalon and

...al corrugations appear in the region representing the diencephalon and the mesencephalon; and the same number appear anterior to the occipital somite. The fact that Next proceed to the Mesencephalon-, Pedunculi Cereiri, Substantia Nigra, Tegmentum, Pons, Medulla and Cerebel

The oculomotor nerve is, consequently, relatively thin. Approaching the mesencephalon in the cleft between the inferior lobes and the base of the midbrain, it pi ...lobus sensitivus VII; s.g.p., secondary gustatory path directed toward the mesencephalon; s.g.VII, secondary VII (gustatory) fibers; s.V, spinal V tract; VII m., de

...sterior surface of Rathke's pouch and extends between the diencephalon and mesencephalon. The carotids are crowded between the lateral cartilages and the lateral lo ...ed variations in this respect, being thicker below the regions of pro- and mesencephalon than below the posterior regions of the brain, The section of the rostral c

...osition of the posterior commissure with reference to the diencephalon and mesencephalon. The depression on the dorsal aspect of the brain between the mesencephalon and telencephalon is filled with a loose mesenchymal network. This tissue s

The outlines between the mesencephalon, thalamencephalon and prosencephalon are easily made out, and correspond cl ...a group of neuroblasts forming the ventral part of the mantle layer in the mesencephalon. These neuroblasts converge to form small rootlets which pass through the g

The diencephalon and the mesencephalon, from our present point of view, are not natural regions, nor can any other ..., substantia nigra, basis pedunculi. III nerve, etc. — in short all of the mesencephalon of the BNA after the subtraction of the colliculus superior and col- liculu

Passing into the mesencephalon at about the level of Kingsbury's commiss. optici tecti a number of larger Fig. 7. Cross section of mesencephalon.

...epidosiren closely resembles that of Protopterus. The thalamencephalon and mesencephalon do not become marked off from one another until relatively late and the cer

...hree groups; (1) an anterior group from the region of the diencephalon and mesencephalon; (2) a middle or cerebellar group in the region between the trigeminal nerv

...SECTIONS AND MODELS ILLUSTRATING THE SENSORY ROOT OF THE TRIGEMINUS TO THE MESENCEPHALON IN A HUMAN EMBRYO.

...— Lillie, and Danchakov; spinal cord — Agassiz & Danchakov; nose, ear and mesencephalon — Hoadley; metanephros — Atterbury; otocyst — Fell; gonads — Minour

...al hfe, and its significance as a measure of growth of that portion of the mesencephalon below the iter is particularly questionable. In some fetuses of three to fo

...hydrocephalus by placing strips of gauze, saturated with iodine, about the mesencephalon.

...is but one opening, and this is only a little larger than the brain stem (mesencephalon) which passes through it. It is evident that when adhesions close the incis ...by the introduction of strips of gauze, saturated with iodine, aroiind the mesencephalon. Other workers such as Burr and MacCarthy (1900),° and

...us geniculum laterale is said to be connected with the anterior arm of the mesencephalon (brachium quadrigeminum superius). In Fig. 12 the s. occipitalis transversu

...ew) he figured the hypophysis as lying caudal to the inferior lobes of the mesencephalon.

...al lymphatic and anteriorly receives two branches, a medial (hidden by the mesencephalon), probably the anlage of the vena lingualis, and a lateral, lying closely a

...te in the anterior medullary velum and emerge on the dorsal surface of the mesencephalon the two efferent wires were bent about the central grey substance and solde

mes., mesencephalon

...of young Amphiuma seventy-two millimetres long, a, b, prosencephalon ; c, mesencephalon ; d, metencephalon ; e, spinal chord.

...spaces, the replaced fluid may be traced along the ventral surface of the mesencephalon. In pig embryos of 23 mm., these replacements show a total filling of the v

...ent blue coloration in the mesenchymal tissue over the rhombencephalon and mesencephalon. In contrast with this, the double solution injection, remaining an hour in

External anatomy of mesencephalon and diencephalon

...asciculaiis. (Nach Frontalschnitteii.) M. ob. Medulla oblongata. ^1/. enc. Mesencephalon. Pr. enc. Prosencephalon. N. II. N opticus. N. III. N. oculomotoricus. N. V