ANAT2341 Lab 10 - Late Embryo
ANAT2341 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment |
Week 8
Vision
Section | Name | Description |
---|---|---|
A6L | Identify - Cornea. Anterior chamber. Lens. Vitreous body. Sensory retina. optic ventricle (artefact). Pigment epithelium.
Conjunctival sac. Primordium of lacrimal glands (near lateral fornix of conjunctival sac). Interorbital ligament. Nose. upper eyelids. | |
A7L | Identify - Medial rectus muscle. Primordium of nasolacrimal ducts.
Upper eyelid (lateral). Lower eyelid (medial). | |
B1L | Identify - Optic nerve. Note extensive temporal region of retina.
Primordium of nasolacrimal ducts. | |
B2L | Identify - Medial and lateral rectus muscles. Pigment epithelium.
Note relationship of eye to nasal capsule, sphenoid cartilage and trigeminal ganglion. Primordium of nasolacrimal ducts (cut obliquely). | |
B3L | Identify - On left course of maxillary division of trigeminal in relation to position of eye (superior to this level). |
Hearing and Balance
Section | Name | Description |
---|---|---|
B3L | Identify - Rhombic lip (developing cerebellum). IVth ventricle. Trigeminal ganglion. Adenohypophysis. Sphenoid cartilage. | |
B4L | Identify - Cochlear duct and temporal cartilage. Semicircular duct (ampulla on L). precartilage of auricle (pinna). malleus (medial, L). Incus (lateral, L). | |
B5L | Identify - Extemal auditory meatus. Auricle.
Incus (dorsal). Malleus (ventral). Tubotympanic recess (auditory rube). Tensor tympani m. (L). Utricle. Semicircular ducts. Intemal auditory meatus (R), containing vestibular and spiral ganglia. Endolymphatic sac (L). Note proximity of sac to choroid plexus of 4th ventricle. | |
B6L | Identify - External auditory meatus. Primordium of tympanic membrane (L).
Manubrium of malleus(L). Meckel's cartilage. Stapes (R). Auditory tube. Basal turn of cochlea duct (L). Endolymphatic sac (R). Common crus (R). Junction of utricle and saccule (R). |
Smell
Section | Name | Description |
---|---|---|
A5L | Identify - Olfactory bulbs. | |
A6L | Identify - Interorbital ligament. nasal septum. primitive olfactory epithelium. | |
A7L | Identify - nasal capsule, nasal conchae, nasal septum, nasolacrimal duct. | |
B1L | Identify - nasal capsule, nasal conchae, nasal septum, nasolacrimal duct. | |
B2L | Identify - Vomeronasal organs (dark spots) beside nasal septum. | |
B3L | Identify - Nasolacrimal ducts | |
B4L | Identify - Tongue | |
B5L | Identify - Unfused palatal shelves either side of tongue. Section through mandible (top of image). |
Vision and Hearing Selected Sections
A1 head and brain | A2 cortex | A3 eye | A4 optic nerve | A5 retina | A6 lens | A7 CN5 and endocrine |
B1 CN5 trigeminal | B2 pituitary | B3 auditory | B4 choroid plexus | B5 membranous labyrinth | B6 inner ear | B7 neck |
Hearing
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Embryonic External Ear
Movement of the external ear in human embryo (week 6 to 8)[1]
Shown below are the changes in external ear development between week 5 to week 8. Development changes from a series of 6 hillocks on arch 1 and arch 2 (week 5) to a structure resembling the adult ear (week 8).
Movement of the external ear in human embryo (week 6 to 8)[1]
- "In all, 171 samples between Carnegie stage (CS) 17 and CS 23 were selected from MR image datasets of human embryos obtained from the Kyoto Collection of Human Embryos. The three-dimensional absolute position of 13 representative anatomical landmarks, including external and internal ears, from MRI data was traced to evaluate the movement between the different stages with identical magnification. Two different sets of reference axes were selected for evaluation and comparison of the movements. ...The results indicate that movement of all anatomical landmarks, including external and internal ears, can be explained by differential growth. Also, when the external ear is recognized as one of the facial landmarks and having a relative position to other landmarks such as the eyes and mouth, the external ears seem to move cranially."
References
- ↑ 1.0 1.1 <pubmed>22296782</pubmed>| PMC3286420 | Head Face Med.
ANAT2341 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment |
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Cite this page: Hill, M.A. (2024, March 28) Embryology ANAT2341 Lab 10 - Late Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/ANAT2341_Lab_10_-_Late_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G