Sensory - Carnegie Stage 22
Embryology - 26 Apr 2024 Expand to Translate |
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Introduction
These histology images are from a human embryo Carnegie stage 22 occurring in week 8 (GA week 10). These are low resolution cross-section images. Where available there are also high resolution virtual slide links.
Senses Links: Introduction | placode | Hearing and Balance hearing | balance | vision | smell | taste | touch | Stage 22 | Category:Sensory |
Hearing and Balance
Virtual Slides - Stage 22 | ||||
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The following are direct links to specific structures. When the embryo virtual slide opens, the view can also be zoomed in or out from the set magnification.
Oral Cavity and Inner Ear: Left Cochlea | Right Cochlea (basal turn) | Right Semicircular canal |
Oral Cavity and Inner Ear
Section | Name | Description |
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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). |
Vision
Vision Links: vision | lens | retina | placode | extraocular muscle | cornea | eyelid | lacrima gland | vision abnormalities | Student project 1 | Student project 2 | Category:Vision | sensory | ||
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Section | Name | Description |
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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). |
Smell
Section | Name | Description |
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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 |
All Sections
A1L | A2L | A3L | A4L | A5L | A6L | A7L |
B1L | B2L | B3L | B4L | B5L | B6L | B7L |
C1L | C2L | C3L | C4L | C5L | C6L | C7L |
D1L | D2L | D3L | D4L | D5L | D6L | D7L |
E1L | E2L | E3L | E4L | E5L | E6L | E7L |
F1L | F2L | F3L | F4L | F5L | F6L | F7L |
G1L | G2L | G3L | G4L | G5L | G6L | G7L |
Glossary Links
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Cite this page: Hill, M.A. (2024, April 26) Embryology Sensory - Carnegie Stage 22. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Sensory_-_Carnegie_Stage_22
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G