Organ of special senses II (98. Cochlea (semi-thin section, toluidine blue)) Flashcards
Identify
- hellcotrema
- scala vestlbuli
- cochlear duct
- scala tympani
- bone
- vestibular
(Reissner’s) membrane - stria vascularis
- spiral ligament,
crista spiralis - basilar membrane
- spiral ganglion
- cochlear nerve
- organ of Corti
Cochlea
-> Identify
3/ cochlear duct
6/ vestibular
(Reissner’s) membrane
7/ stria vascularis
10/ spiral ganglion
13/ tunnel of Corti
14/ tectorial membrane
15/ Hair cells
The spiral ganglion (10) is situated in ___
the spiral canal of the modiolus.
The spiral ganglion (10) is situated in ___
the spiral canal of the modiolus.
What types of cells does spiral ganglion (10) contain?
This ganglion contains large bipolar cells with round or oval perikaryon
Cochlear duct
-> Which structures make up the borders of the cochlear duct (or Scala media)?
The basilar membrane (9), the vestibular (Reissner’s) membrane (6) and the stria vascularis (7)
What type of epithelial lining do sla tympani and scala vestibuli have?
Simple squamous epithelial lining
(except the side of the basilar membrane facing the scala tympani, where the epithelium is simple cuboldal).
What is Basilar membrane (9)?
A connective tissue layer,
Where does the basilar membrane terminate? What is its role?
it terminates at the crista spiralis (8) and supports the organ of Corti (12).
What is Vestibular (Reissner’s) membrane (6)?
A thin connective tissue layer, covered by simple squamous epithelium on both sides.
What type of epithelium is the Stria vascularis (7)?
Stratified cuboidal epithelium (rich in capillaries).
Which type of epithelium is the only one containing blood vessels?
Stratified cuboidal epithelium (rich in capillaries).
What is the role of Stria vascularis (7)?
Stria vascularis produces
endolymph which fills the cochlear duct
Figure 98/C. The organ of Corti
-> Identify 16 - 20
- spiral llmbus and the auditory teeth
- interdental cell
- cuticle
- vestibular lip of spiral limbus
- Inner hair cell
Figure 98/C. The organ of Corti
-> Identify 21 - 25
- Inner pillar cell
- outer pillar cell
- outer hair cell
- reticular membrane (apical process of Delters’ phalangeal cells)
- outer border cell
Figure 98/C. The organ of Corti
-> Identify 26 - 30
- Hensen’s phalangeal cells
- Claudius’ phalangeal cells
- Boettcher’s phalangeal cells
- Deiters’ phalangeal cells
- cuboidal epithelium of scala tympani
Figure 98/C. The organ of Corti
-> Identify 31 - 35
- nerve fibres
- osseous spiral lamina
- tympanic lip of spiral llmbus
- inner border cell
- inner phalangeal cell
Figure 98/C. The organ of Corti
-> Identify *
- tunnel of Corti and the other tunnels
What is the role of The ORGAN OF CORTI (12)?
spiral organ contains the hair cells (sensory epithelium), different supporting cells and the tectorial membrane
The inner (21) and outer (22) pil
lar cells (the darkest cells) are bordering the triangular space called ___
tunnel of Corti (*).
There is a single row of ___, supporting a single row of inner hair cells (20) (on the inner side of the inner pillar cell).
inner phalangeal cells (35)
Beyond the outer pillar cell, there are 3-5 rows of outer hair ceils (23) placed on the top of ____
the outer phalangeal cells of Deiters (29).
The tectorial membrane (14) is a flap-like mass, originating from ____, produced by the Interdental cells (17).
the vestibular lip of spiral llmbus (19),
The tectorial membrane (14) is a flap-like mass, originating from the vestibular lip of spiral llmbus (19), produced by ____
the Interdental cells (17).
There are 3 tunnels (*) in the Corti organ
-> What are they?
- the inner tunnel (tunnel of Corti)
- middle tunnel (space of Nuel) 3. The outer tunnel
There are 3 tunnels (*) in the Corti organ: the inner tunnel (tunnel of Corti), middle tunnel (space of Nuel) and the outer tunnel
-> all filled with ____
Corti-lymph
What is Corti-lymph?
Corti-lymph has an ion content similar to that of perilymph
Beyond the outer phalangeal {Deiters’) cells other supporting cells are found
-> What are they?
the Hensen’s, Claudius’ and Boettcher’s cells.
- Cochlea (semi-thin section, toluidine blue
-> Identify
1)helicotrema.
2)modiulus.
3)cochlear nerve.
4)bone.
6)spiral canal with spiral ganglion.
7)spiral limbus.
- Cochlea (semi-thin section, toluidine blue
-> Identify
4)bone.
6)spiral canal with spiral ganglion.
7)spiral limbus.
8)scala vestibuli.
9)scala media (cochlear duct).
10)scala tympani.
11)vestibular (Reissner’s) membrane.
12)stria vascularis.
13)basilar membrane.
14)spiral ligament (crista spiralis).
15)tectorial membrane.
16)interdental cells.
18)organ of corti
19)claudiu’s phalangeal cells.
20)inner hair cell.
21)outer hair cell.
22)lamina spiralis ossea.
- Cochlea (semi-thin section, toluidine blue
-> Identify
8)scala vestibuli.
9)scala media (cochlear duct).
10)scala tympani.
11)vestibular (Reissner’s) membrane. 12)stria vascularis.
13)basilar membrane.
14)spiral ligament (crista spiralis).
15)tectorial membrane.
16)interdental cells.
19)claudiu’s phalangeal cells.
20)inner hair cell.
21)outer hair cell.
22)lamina spiralis ossea.
*-organ of corti.
&-tunnel of corti.
Op)outer pillar cell.
Ip)inner pillar cell.
- Cochlea (semi-thin section, toluidine blue
-> Identify
7)spiral limbus.
8)scala vestibuli.
9)scala media (cochlear duct).
10)scala tympani.
12)stria vascularis.
13)basilar membrane.
14)spiral ligament (crista spiralis).
15)tectorial membrane.
16)interdental cells.
19)claudiu’s phalangeal cells.
*-organ of corti.
Identify 1 - 4
Identify 5 - 7
5 - Epithelium of spiral limbus
6 - Vestibular membrane
7 - Vestibular duct
Identify 8 - 11
8 - Inner spiral tunnel
9 - Cochlear duct (scala media)
10 - Tectorial membrane
11 - Outer hair cells
Identify 12 - 13
12 - Inner tunnel
13 - Organ of Corti
Identify 14 - 17
14 - Bony wall of cochlea
15 - Stria vascularis
16 - Basilar membrane
17 - Spiral ligament
