Ana313 Flashcards
Two large bundles of fibres; cerebral peduncles are seen on the anterior aspect of the midbrain
one on each side of the midline.
& These fibres are separated by a deep fissure.
& Near the pons
the fissure is narrow
corresponding cerebral hemispheres.
& Below the cerebrum
the peduncles form the posterior boundary of a space
called the
interpeduncular fossa.
On the posterior surface are four rounded colliculi (corpora quadrigemina).
& These are divided into superior and inferior pairs by a vertical and a transverse groove
& The superior colliculi are centers for visual reflexes and the inferior colliculi are lower auditory
centers.
& Each colliculus is related laterally to a ridge called the brachium.
The superior brachium/superior quadrigeminal brachium or brachium of superior colliculus
connects the superior colliculus to the lateral geniculate body.
V
The inferior brachium/inferior quadrigeminal brachium or brachium of inferior colliculus connects
the inferior colliculus to the medial geniculate body.
X In the midline below the inferior colliculi is superior medullary velum
where the trochlear nerves
emerge.
What are the cerebral peduncles?
Two large bundles of fibres located on the anterior aspect of the midbrain.
What separates the fibres of the cerebral peduncles?
A deep fissure.
How does the fissure between the cerebral peduncles change in width?
It is narrow near the pons but broadens as the peduncles diverge.
What space is formed below the cerebrum by the cerebral peduncles?
Interpeduncular fossa.
What structures are found on the posterior surface of the midbrain?
Four rounded colliculi (corpora quadrigemina).
How are the colliculi divided?
Into superior and inferior pairs by a vertical and a transverse groove.
What is the function of the superior colliculi?
Centers for visual reflexes.
What is the function of the inferior colliculi?
Lower auditory centers.
What is related laterally to each colliculus?
A ridge called the brachium.
What does the superior brachium connect?
The superior colliculus to the lateral geniculate body.
What does the inferior brachium connect?
The inferior colliculus to the medial geniculate body.
What is located in the midline below the inferior colliculi?
Superior medullary velum.
Where do the trochlear nerves emerge?
From the superior medullary velum.
Where is the pharynx situated?
Behind the nasal cavities, the mouth, and the larynx
What are the three parts of the pharynx?
- Nasal part
- Oral part
- Laryngeal part
What is located at the upper end of the pharynx?
Its upper, wider end lies under the skull
What does the lower end of the pharynx become continuous with?
The esophagus
At which cervical vertebra does the pharynx become continuous with the esophagus?
Opposite the sixth cervical vertebra
