Brainstem Afferent Systems Flashcards
The inferior Olivary nucleus and hypoglossal nucleus are found at what level of the brain stem?
Lower medulla - level of Olivary nuclei
The central canal, which is the lowest part of the 4th ventricle, is found at what brainstem level?
Lower (closed) medulla - level of pyramidal decussation
The 4th ventricular space, choroid plexus and The nucleus of CN XII are found at what brainstem level?
Upper (open) medulla
A large middle cerebellar peduncle, the nucleus of CN VI and the motor nucleus of CN VII are found at what level of the brainstem?
Lower pons
Lateral middle cerebellar peduncles and the trigeminal mesencephalic tract are found at what level of the brainstem?
Mid-pons
The cerebral aqueduct and the decussation of superior cerebellar peduncles (DSCP) are found at what level of the brainstem?
Lower midbrain
The red nucleus and nuclei of CN III are found at what level of the brainstem?
Upper midbrain
What nucleus is located within the medulla (lower-upper), and is composed of second order neurons which receive crude tactile pain and temperature sensation from the face, orbit, meninges, and oral and nasal cavities. Analogous to the dorsal horn gray matter of the spinal cord?
Spinal nucleus of V (trigeminal)
What nucleus is located in the floor of the 4th ventricle at all medullary levels, it’s fibers exit ventrally between the olive and pyramid in the preolivary sulcus and innervates most of the extrinsic and intrinsic muscles of the tongue?
Hypoglossal nucleus
What nucleus is parasympathetic, means wander, is located next to the hypoglossal nucleus throughout the medulla and innervates thoracic and abdominal viscera?
Parasympathetic nucleus of the vagus
What nucleus lies dorsolateral to the nuclei of XII and X, looks like a “tigers eye”, and integrates information from viscera of abdomen and thorax, smooth muscle from blood vessels and from receptors in the carotid body and sinus and the special sensory of taste?
Fasciculus (tractus) and nucleus solitarius
What nucleus is located ventral medial to the spinal trigeminal nucleus, gives rise to fibers which provide motor control to skeletal muscle in the pharynx and larynx and contains cell bodies of the spinal contribution to the spinal accessory nerve as well as fibers that contribute to CN IX and X?
Nucleus ambiguus
What nucleus lies anterolateral to the abducens nucleus at the level of the lower to mid pons and innervates the muscles of facial expression?
Facial nucleus
What nucleus lies below the floor of the 4th ventricle at lower to midpontine levels and innervates the ipsilateral lateral rectus muscle of the eye?
Abducens nucleus
What nucleus lies at midpontine levels just medial to the fibers of the trigeminal nerve as they pass through the tegmentum and the middle cerebellar peduncle and innervates the muscles of mastication?
Motor nucleus of trigeminal nerve
What nucleus lies immediately lateral to its tract and extends rostrally up from the pons to the midbrain, in the midbrain it is found lateral to the periaquaductal grey matter, contains primary sensory neurons that are involved in proprioception from the muscles and joints associated with mastication, chewing reflexes and conscious and unconscious position sense?
Mesencephalic nucleus of tract of V
What nucleus lies lateral to the fibers of the trigeminal nerve at the rostral pons level and receives discriminatory tactile information from the face, analogous to nucleus cuneatus and gracillis?
Principle sensory nucleus of V
What nucleus lies below the cerebral aqueduct and dorsal to the MLF at the level of the inferior colliculus, innervates the superior oblique muscle of the eye?
Trochlear nucleus
What nucleus lies below the aqueduct at the level of the superior colliculus and innervates all the extrinsic muscles of the eye except the lateral rectus and superior oblique?
Oculomotor nucleus
What nucleus is cradled by the oculomotor nucleus (butterfly) and innervates smooth muscle for lens accommodation and pupillary constriction?
Edinger-Westphal nucleus
What nerve provides all general sensations ( touch, pain and temperature, vibration, etc.) for the face as well as the oral and nasal cavities?
V
What CN’s provide visceral sensations relating to blood pressure, heart rate, as well as general sensations derived from the abdominal viscera?
IX and X
What CN’s carry taste sensation (a special sense) from the tongue, pharynx and epiglottic region?
VII, IX and X
Pain and temperature are relied on what trigeminal CNS connection?
Descending spinal tract and nucleus of CN V
