ZOO 4605 Lecture Notes - Lecture 7: Otic Vesicle, Scarpa'S Ganglion, Pharyngeal Groove

39 views13 pages

silverporpoise729

20 Jun 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

ZOO 4605-A001

06/06/18

External ear

oAuricle

Cartilage

Middle ear

oAuditory tube

oTympanic membrane

Internal ear

o3 ossicles (bones)

Malleus

Incus

Stapes

Connected to a window called the oval window

Behind the window is the cochlea and 3 semicircular canals

3 canals are called the vestibular system and controls the body

equilibrium

Superior

Inferior

Horizontal

At the base of the semicircular canal we have a dilated part called the ampulla, and then the

utricle and saccule

Inside the cochlea and semicircular canal there is perilymph and endolymph

Inside of cochlear we also have the organ of corti

Organ of corti, ampulla, utricle, and saccule contain hair cells which are connected to sensory

nerve

oCochlear nerve for cochlea

oVestibular nerve for vestibular system

Weak 4

oThickening of ectoderm becomes the otic placode which becomes the otic vesicle

Picture on phone 06/06

The groove gives rise to the auditory tube

Below it is the tympanic membrane

The right picture (otic vesicle) has two parts

Utricle portion

Nerve passes through the vestibular ganglion

Gives rise to utricle part of vestibular system

Semicircular canals

Vestibular ganglion

And inner portion of semicircular canal (membranous )

(bottom left drawing)

Membranous part contains endolymph from

the utricular portion

Two lumps underneath are the utricle and

saccule, both of which have hair cells

Saccule portion

find more resources at oneclass.com

Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in

Nerve passes through spiral ganglion

Gives rise to

Saccule

Organ of corti

Bottom right drawing

3 parts

Scala vestibuli

Scala media

Hair cells

Scala tympani

Spiral ganglia

Otic vesicle has 2 parts

Utricular portion

During intrauterine life, the neck area of the embryo has some pharyngeal arches

oAt the beginning we have a total of six, but number 5 degenerates

Gives rise to bones of face

Zygomatic

Maxillary

Mandible

Failure of development of this arch leads to pharyngeal arch 1

syndrome and newborn does not have those 3 bones on his face

Can be fixed by plastic surgery

Gives rise to malleus which is attacked to tympanic membrane

The mandibular branch of the third branch of cranial nerve 5,

trigeminal nerve (V3)

The incus has the same origin and innervation

Stapes org



Auditory tube

Originates from pharyngeal GROOVE 1 (not arch )

Innervation is by the mandibular branch of the trigeminal and

glossopharyngeal

Tympanic membrane rises from pharyngeal membrane 1

Innervation is by mandibular branch of CN 5 and 9, trigeminal

and glossopharyngeal

Auricle

Comes from pharyngeal groove

Innervation is by mandibular branch trigeminal nerve, CN 7, 9,

10, cervical nerve 2 and 4

When mother has a viral infection such as rubella it

affects the organ of corti and infant is deaf

2 -gives rise to

stapes

Innervated by facial nerve (CN7)

See pics on phone of slide

Anatomic structure of eye

o3 layers of wall of eye (external to internal)

find more resources at oneclass.com

Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in

Sclera

Continues ventrally with the cornea

Choroid

Full of blood vessels which give nutrients to eye

Ventrally continues with the iris

Full of pigment cells

Retina

The inner layer

Has 6 layers

First

Pigment cells

Second

Photoreceptors

2 types

Rods

Cones

Third

Bipolar neuron

Fourth

Horizontal neuron

Fifth

amacrine

Sixth layer

Ganglion cells or ganglion neurons

Forms optic nerve

oVentral portion of eye has 2 chambers

Anterior

Canal of schlemm

Opens into the venous system

Iris

Ciliary body

Secretes small amount of fluid which is released into

the posterior chamber then the anterior chamber next

Anterior chamber then opens into the canal of schlemm

and fluid is released into the venous system through the canal

Purpose is to keep small amount of humidity inside the

eye

The canal controls the fluid amount

Glaucoma is due to the obstruction of canal of schlemm

and fluid accumulates inside of time

If not treated soon by surgery it hurts the optic

nerve and retina

Ciliary muscle

Posterior

oEmbryonic origin of eye

oSecond picture from 06/05 (primitive form of eye)

Optic cup

Has 2 layers (of future retina)

find more resources at oneclass.com

Unlock document

This preview shows pages 1-3 of the document.
Unlock all 13 pages and 3 million more documents.

Already have an account? Log in

Document Summary

Connected to a window called the oval window. Behind the window is the cochlea and 3 semicircular canals. 3 canals are called the vestibular system and controls the body equilibrium. At the base of the semicircular canal we have a dilated part called the ampulla, and then the utricle and saccule. Inside the cochlea and semicircular canal there is perilymph and endolymph. Inside of cochlear we also have the organ of corti. Organ of corti, ampulla, utricle, and saccule contain hair cells which are connected to sensory nerve o. Cochlear nerve for cochlea: vestibular nerve for vestibular system. Thickening of ectoderm becomes the otic placode which becomes the otic vesicle. The groove gives rise to the auditory tube. The right picture (otic vesicle) has two parts. Gives rise to utricle part of vestibular system. And inner portion of semicircular canal (membranous ) (bottom left drawing) Membranous part contains endolymph from the utricular portion.

ZOO 4605 Lecture Notes - Lecture 7: Otic Vesicle, Scarpa'S Ganglion, Pharyngeal Groove

Document Summary

Get access

Related Documents

BIO210Y5 Lecture Notes - Lecture 11: Ear Canal, Bony Labyrinth, Semicircular Canals

ANAT 215 Lecture Notes - Lecture 16: Bony Labyrinth, Tympanic Cavity, Semicircular Canals

BIOSC-101 Lecture Notes - Lecture 32: Vestibular Duct, Bony Labyrinth, Cochlear Duct