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Neuroscience Block 1
Brainstem Topography and Cranial Nerves
18
Medical
Graduate
05/06/2010

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Term
Basal Ganglia
Thalami
Midbrain
Pon
Medulla

-It’s the brainstem and other stuff.
Definition
Basal Ganglia: part of the Telencephalon.
Thalami: part of the Diencephalon
Midbrain: part of the Mesencephalon
Pon: part of the Metencephalon
Medulla: part of the Myencephalon
Term
Cerebral Peduncle
Definition
1. Crus Cerebri
2. Substantia Nigra
3. Midbrain Tegmentum
Term
Solitarius
Definition
solitary tract and nucleus are structures in the brainstem that carry and receive visceral sensation and taste from the facial (VII), glossopharyngeal (IX) and vagus (X) cranial nerves.
Term
Edinger Westphal nucleus
Definition
(also known as the accessory oculomotor nucleus ) is the accessory parasympathetic cranial nerve nucleus of the oculomotor nerve (cranial nerve III), supplying the constricting muscles of the iris.
Term
Salivatory nuclei
Definition
(or superior salivatory nucleus) of the facial nerve is a visceromotor cranial nerve nucleus located in the pontine tegmentum.

Parasympathetic efferent fibers of the facial nerve (preganglionic fibers) arise according to some authors from the small cells of the facial nucleus, or according to others from a special nucleus of cells scattered in the reticular formation, dorso-medial to the facial nucleus.
Term
Fovea
Definition
A slight depression or pit
Term
Trigone
Definition
Triangular anatomical structures
Term
Peduncle
Definition
the thin process of tissue that attaches a polyp (an abnormal growth of tissue projecting from a mucous membrane) to the body.
Term
Facial colliculus
Definition
an elevated area located on the dorsal pons. It is formed by motor fibres of the facial nerve as they loop over the abducens nucleus. Thus a lesion to the facial colliculus would result in facial muscle paralysis.
Term
Colliculus
Definition
A small elevation
Term
Brachium
Definition
branching
Term
Geniculate body
Definition
A neural way station located at the upper end of the brainstem that relays visual impulses.
Term
Trochlear Nerves
Definition
CN 4
Term
Infundibulum
Definition
-A funnel-shaped cavity (pit: a sizeable hole).
-The floor of the diencephalon becomes the infundibulum. The infundibulum becomes the neurohypophysis or the posterior pituitary.
Term
Cranial Nerves
Definition
Differ from spinal nerves by:
1. Attaching to brain
2. Have additional component types (GSE, SSA, etc).
3. Not every nerve has every component
Term
Components of Spinal Nerves
are all GENERAL
Definition
AFFERENT: GSA (Somatic) and GVA (Visceral)
EFFERENT: GVE (Visceral) and GSE (Somatic)

Neuronal cell groups supporting these functions will be found in specific regions of the Mantle Layer (A layer of cells in the developing spinal cord that gives rise to the grey matter).
Term
“SPECIAL” Components of Cranial Nerves
Definition
Afferent:
Somatic (GSA)
Somatic (SSA)
Visceral (GVA and SVA)

Efferent
Somatic (GSE)
Visceral (GVE)
Visceral (SVE)
Term
CRANIAL NERVES AND THEIR COMPONENTS
Definition
CN 1: SVA
CN 2: SSA
CN 3: GSF, GVE
CN 4: GSF
CN 5: GSA, SVE
CN 6: GSF
CN 7: GSA, SVA, GVE, SVE
CN 8: SSA
CN 9: GSA, GVA, SVA, GVE, SVE
CN 10: GSA, GVA, SVA, GVE, SVE
CN 11: SVE
CN 12: GSE
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