Peripheral Nerve Anatomy Flashcards
3 branches of the Trigeminal Nerve (CN V):
- Ophthalmic
- Maxillary
- Mandibular
Anesthetic interest = trigeminal neuralgia
Glossopharyngeal (IX) innervation:
-oropharynx
-soft palate
-posterior 1/3 portion of the tongue
-pharyngeal surface of epiglottis
Blocks gag reflex, and posterior pharynx (nasal intubation)
SLN innervation:
-base of tongue
-posterior surface of epiglottis
-aryepiglottic fold
-arytenoids
SLN: arises from the _____ ______ of the _____ nerve.
Descends behind the _______ carotid artery at the level of the greater cornu of the _____ bone.
inferior ganglion
vagus nerve
internal
hyoid bone
SLN : the external branch supplies the ______ muscle while the internal branch pierces the ______ membrane and supplies _____ innervation to the _____ and ____.
cricothyroid
thyrohyoid membrane
sensory
larynx and hypopharynx
RLN innervation:
vocal folds and trachea
Cervical plexus: ______ Rami C__-___
Ventral Rami
C1-C4
midpoint, posterior border of SCM
Interscalene space:
Emerge between anterior and middle scalene muscle
Injection into sheath
Commonly produces complete block of upper extremity
Divisions: 3 ______ (anterior) supply ____ portions
3 ____ (posterior) supply _____ portions
ventral
flexor
dorsal
extensor
Nerves from cords:
Lateral:
Medial:
Posterior:
Lateral and medial:
Lateral: musculocutaneous
Medial: Ulnar
Posterior: radial and axillary
Lateral and medial: median
Axillary nerve: formed from C…
C5-C6
Radial Nerve: formed from C….
C5-T1
Radial Nerve response to stimulation: wrist ____, finger ____, thumb ____
extension
extension
abduction
Musculocutaneous Nerve formed from:
descends between the ______ muscle and the _____ _____ muscle
C5-C7
brachialis
biceps brachii
At the elbow the musculocutaneous nerve becomes the _______ ______ ______ nerve.
Lateral antebrachial cutaneous
Motor response of musculocutaneous nerve
biceps flexion
Median nerve arises from…
descends arm with the ___ artery
C5-T1
brachial
Median Nerve: muscle action
Forearm –>
Wrist–>
Fingers –>
Thumb –>
Forearm –>. pronators
Wrist–>. flexors
Fingers –> flexors
Thumb –> abduction and opposition
Median Nerve: skin innervation
Thumb, index, middle, lateral half of ring fingers on palmar surface and nail beds
Median innervation: motor response to stimulation:
-wrist flexion
-finger flexion
-thumb opposition
Ulnar Nerve arises from
C8-T1
also descends with brachial artery
Ulnar nerve motor response to stimulation:
-ulnar deviation of the wrist
-metacarpo-phalangeal flexion
-thumb abduction
Allows you to snap your thumb with your fingers
Lumbrosacral Plexus formed by ____ Rami L__-S__
Ventral Rami
L1-S5
What innervates the parietal peritoneum?
-Iliohypogastric Nerve
-Ilioinguinal Nerve
Formed from T12-L1
Travels in abdominal wall to level of symphysis pubis
What innervates the skin on femoral hiatus, skin of scrotum and skin on labia majora?
Genitofemoral Nerve L1-L2
