Stephens - L4

Question 1

What does the ansa cervicalis arise from? Where does the superior root come from? Where does the inferior root run?

Answer 1

Arises from C1-C3

Superior root comes from hypoglossal n (XII)
Inferior root crosses the IJv

Question 2

Talk about the phrenic n.

Answer 2

Seen anterior to the ant scalene m
Innervates the diaphragm
Transverse cervical and suprascapular aa run over it
Accompanied by ascending cervical a
Travels posteriorly to subclavian v
Unilateral paralysis causes no sx

Question 3

What 2 things run through the interscalene triangle?

Answer 3

Subclavian a and the Brachial Plexus

Ant scalene syndrome can compress the BP which is bad

Question 4

Define GSA.

Answer 4

General Somatic Affarent, fibers that convey sensory information

Question 5

Define GVA

Answer 5

General Visceral Affarent, fibers that convey sensory information from viscera/organs

Vagus n is a HUGE players in GVA (Gvagus..)

Question 6

What does the vagus innervate with GVA fibers?

Answer 6

Posterior 1/3rd of tongue all the way down to the transverse colon

Question 7

Define GSE.

Answer 7

General Somatic Efferent, fibers that innervate muscle of myotomic origin

Question 8

Define GVE.

Answer 8

General Visceral Efferent, fibers associated with symp and parasymp divisions of the ANS

These fibers course through CNs: 2, 7, 9, 10

Question 9

Define SVA.

Answer 9

Special visceral affarent, olfactory smell and taste info

Question 10

Define SVE.

Answer 10

Special Visceral Efferent, innervates the muscles from mastication , facial expressions, larynx and pharynx

Question 11

What is the Trigeminal Sensory Nucleus?

Answer 11

GSA sensory nucleus for all sensations to the face

Involved CNs: V, VII, IX, X

Question 12

What is the Solitary Nucleus (NTS)?

Answer 12

SVA and GVA, sensory nucleus for general sensations from posterior 1/3rd of tongue to transverse colon

CNs involved: VII, XI, X (big one)

Question 13

What is the Dorsal Motor Nucleus?

Answer 13

Sends pre-gang fibers to ganglia in the: larynx, pharynx, thorax, abdomen

Sends post-gang fibers to glands and smooth m in these regions

CN involved is VAGUS N (X)

Question 14

What constitutes the SVE column?

Answer 14

CNs: V, VII, IX, X, XI

Question 15

What are the superficial cranial nn? Where do they arise from? What do they innervate?

Answer 15

Lesser occipital n
Greater auricular n
Transverse cervical n
Supraclavicular n

Arise from C2-4

Innervate skin