2011 Lab 10 - Late Embryo
2011 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment |
Week 8
Vision
Section | Name | Description |
---|---|---|
A6L | Cornea. Anteriorchamber. 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 | Medial rectus muscle. Primordium of nasolacrimal ducts.
Upper eyelid (lateral). Lower eyelid (medial). | |
B1L | Optic nerve. Note extensive temporal region of retina.
Primordium of nasolacrimal ducts. | |
B2L | 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 | On left, note course of maxillary division of trigeminal in relation to position of eye (superior to this level). |
Hearing and Balance
Section | Name | Description |
---|---|---|
B3L | Rhombic lip (developing cerebellum). IVth ventricle. Trigeminal ganglion. Adenohypophysis. Sphenoid cartilage. | |
B4L | Cochlear duct and temporal cartilage. Semicircular duct (ampulla on L). precartilage of auricle (pinna). malleus (medial, L). Incus (lateral, L). | |
B5L | 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 | 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 | Olfactory bulbs. | |
A6L | Interorbital ligament. nasal septum. primitive olfactory epithelium. | |
A7L | Description | |
B1L | Description | |
B2L | Vomeronasal organs (dark spots) beside nasal septum. | |
B3L | Nasolacrimal ducts | |
B4L | Tongue | |
B5L | Unfused palatale 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
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).
References
2011 Lab 10: Introduction | Early Embryo | Late Embryo | Fetal | Postnatal | Abnormalities | Online Assessment |
Glossary Links
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Cite this page: Hill, M.A. (2024, May 27) Embryology 2011 Lab 10 - Late Embryo. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/2011_Lab_10_-_Late_Embryo
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G