SHS 311 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
fibers carry information received by the sensory receptors
to higher neural centers. (goes up)
Afferent
Afferent fibers
a. Radial or Type I fibers from inner hair cells.
b. Outer Spiral or Type II fibers from outer hair cells.
fibers send signals from higher neural centers back to the
sensory receptors. (goes down)
Carries from central level back to peripheral level as a
feedback.
Efferent fibers
a. Lateral Olivary Complex fibers (LOC) coming from the
lateral areas of the olivary complex which are either un-
Efferent crossed olivocochlear bundle fibers from the ipsilateral
side or crossed olivocochlear bundle fibers from the con-
tralateral side. They synapse on afferent fibers leaving the
inner hair cells.
b. Medial Olivary Complex fibers (MOC) coming from
the medial areas of the olivary complex which are either
uncrossed olivocochlear bundle fibers from the ipsilateral
side or crossed olivocochlear bundle fibers from the con-
tralateral side. They synapse directly on the outer hair cells.
85-95% of the fibers,
thick, many fibers
Radial (R)-Type I
innervate a few IHCs ("one-to-many")
Fibers (Afferent Tracts)
Info going up is mainly from inner hair cells and not outer
hair cells
5-15% of the fibers,
Outer Spiral (OS)-
thin, each fiber innervates a large number of OHCs
Type II Fibers (Atterent Tracts)
("many-to-one")
,SHS 311 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Etterent tracts
, 1: Uncrossed
Medial Olivary Complex (MOC)
2: Uncrossed
Lateral Olivary
Complex (LOC)
3: Crossed MOC
4: Crossed LOC
Thus, there
is a CROSSED
and an UNCROSSED
Olivo-Cochlear
Bundle (OCB)
Goes from brainstem to inner and outer hair cells
The cell body of each AN, called Spiral Ganglion, sits within
Rosenthal's canal in the modiolus.
Each soma projects a single dendritic fiber through habe-
Connection with HCs nula perforata on the osseous spiral lamina, and synapses
on the hair cell body.
Each soma also projects another fiber axon to brain stem
structure, cochlear nucleus.
Vestibular Nerve In charge of balance
Auditory Nerve In charge of hearing
The neural activity that happens without any acoustic input
Spontaneous Response (no sound). Neurons randomly generate action potential
over time.
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
fibers carry information received by the sensory receptors
to higher neural centers. (goes up)
Afferent
Afferent fibers
a. Radial or Type I fibers from inner hair cells.
b. Outer Spiral or Type II fibers from outer hair cells.
fibers send signals from higher neural centers back to the
sensory receptors. (goes down)
Carries from central level back to peripheral level as a
feedback.
Efferent fibers
a. Lateral Olivary Complex fibers (LOC) coming from the
lateral areas of the olivary complex which are either un-
Efferent crossed olivocochlear bundle fibers from the ipsilateral
side or crossed olivocochlear bundle fibers from the con-
tralateral side. They synapse on afferent fibers leaving the
inner hair cells.
b. Medial Olivary Complex fibers (MOC) coming from
the medial areas of the olivary complex which are either
uncrossed olivocochlear bundle fibers from the ipsilateral
side or crossed olivocochlear bundle fibers from the con-
tralateral side. They synapse directly on the outer hair cells.
85-95% of the fibers,
thick, many fibers
Radial (R)-Type I
innervate a few IHCs ("one-to-many")
Fibers (Afferent Tracts)
Info going up is mainly from inner hair cells and not outer
hair cells
5-15% of the fibers,
Outer Spiral (OS)-
thin, each fiber innervates a large number of OHCs
Type II Fibers (Atterent Tracts)
("many-to-one")
,SHS 311 Comprehensive Resource To Help You Ace 2026-2027 Exams Includes Frequently
Tested Questions With Elaborated 100% Correct Complete Solutions
Guaranteed Pass First Attempt!! Current Update!!
Etterent tracts
, 1: Uncrossed
Medial Olivary Complex (MOC)
2: Uncrossed
Lateral Olivary
Complex (LOC)
3: Crossed MOC
4: Crossed LOC
Thus, there
is a CROSSED
and an UNCROSSED
Olivo-Cochlear
Bundle (OCB)
Goes from brainstem to inner and outer hair cells
The cell body of each AN, called Spiral Ganglion, sits within
Rosenthal's canal in the modiolus.
Each soma projects a single dendritic fiber through habe-
Connection with HCs nula perforata on the osseous spiral lamina, and synapses
on the hair cell body.
Each soma also projects another fiber axon to brain stem
structure, cochlear nucleus.
Vestibular Nerve In charge of balance
Auditory Nerve In charge of hearing
The neural activity that happens without any acoustic input
Spontaneous Response (no sound). Neurons randomly generate action potential
over time.
