Exam 2 General info. on brainstem nuclei Flashcards Preview

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Flashcards in Exam 2 General info. on brainstem nuclei Deck (19):

Edinger Westphal nucleus- Parasympathetic control of ciliary & pupillary constrictor smooth muscles of the eye

Accessory Oculomotor (Lower motor neuron)


Somatic motor muscle control for 4 of the 6 extraocular eye muscles & upper eyelid (levator palperbrae superioiris)

Oculomotor Nuclei (Lowe motor neuron) C.N III


Somatic motor muscle control for the superior oblique extraocular eye muscle. (moves eyeball)

Trochlear Nucleus (Lower motor neuron)


Proprioception from muscles of mastication & perhaps periodontial ligaments of the teeth
- Sensory function
- Nucleus of termination
- C. N. V

Trigeminal Mesencephalic Nucleus


Somatic motor to muscles of mastication. Also tensor villi palatini, tensor tympani, anterior belly of digastric & mylohyoid m.

Trigeminal Motor Nucleus


Somatic motor muscle control for the lateral Rectus extraocular eye muscle. C.N. VI

Abducens Nucleus


Most superficial somatic motor muscles of the scalp & face (muscles of facial expression). Include the posterior belly of the digastric m. & the platysma m.

Facial Nucleus


Parasympathetic control of lacrimal (tear) glands, submandibular & sublingual salivary glands.

Superior Salivatory Nucleus


Parasympathetic control of parotid salivary gland.

Inferior Salivatory Nucleus


Equilibrium & hearing, respectively. These nuclei are complex & subdivided into parts.

Vestibular & cochlear nuclei
Nucleus of termination
Sensory function
C.N VIII on each side


Somatic motor muscle control for 16 of 18 named tongue muscles.
Nucleus of origin

Hypoglossal Nucleus


Sensory & motor (parasympathetic) of organs supplied such as voice, heart, lung, & intestines in C.N X

Dorsal Nucleus of Vagus


Nerves IX, X, XI all share this nucleus in delivery of visceral efferent (motor) fibers to the pharynx musculature

Nucleus ambiguus


Sensory reception via the VII, IX, X C.N primarily dealing with taste from the tongue, palate & pharynx
- Nucleus of termination
- Preganglionic parasympathic neurons

Nucleus Solitarius


AKA: Nucleus of the spinal trigeminal tract.
The main sensory reception nucleus for the face dealing with pain, thermal, discrimative tactile & proprioception. The caudal section extends down to the C3-4 cord levels.
C.N VII, IX, X also contribute here.

Spinal trigeminal nucleus
Nucleus of termination


Somatic motor nucleus for movement of the important neck/ head muscles called the sternocleidomastoids & trapezius. Most fibers originate in the upper 5 cervical cord levels & lower M.O.

Spinal Accessory nucleus


Where cranial nerve appears to be attached to the surface of the CNS (e.g The trigeminal nerves' _______ origin is out of the side of the pons )

Apparent Origin


The nucleus or nuclei that contribute motor fibers to the cranial nerve(s). These are located inside the CNS (e.g. the hypoglossal nucleus for CN XII is located inside the M.O.

Nucleus of origin


Nucleus or nuclei that receive incoming AFFERENT input from the cranial nerve(s). These are also located inside the CNS (e.g. the solitary nucleus of the M.O. which serves as a taste reception center for C.N.'s VII, IX, & X

Nucleus of termination