Peripheral Nerve Anatomy - Quiz 7 Flashcards
Which Cranial Nerve is responsible for the Sensory Innervation of the Face?
CN V - Trigeminal Nerve
Ophthalamic
Maxillary
Mandibular
Label 1-8 of the Airway Nerves

- Cervical Sympathetic Ganglion
- Inferior Ganglion of Vagus Nerve
- Pharyngeal Nerve
- SLN
- Internal Laryngeal Branch
- External Laryngeal Branch
- Internal Laryngeal Branch - RLN
- Vagus Nerve
- RLN

What does the Glossopharyngeal Nerve Innervate?
Oropharynx
Soft Palate
Posterior 1/3 of Tongue
Pharngeal Surface of Epiglottis
What does the SLN Innervate?
Tongue Base
Posterior Surface of Epiglottis
Aryeepiglottic Fold
Arytenoids
The SLN can be blocked by _________
The SLN can be blocked by MUCOSAL SATURATION
The SLN arises from _________ of the Vagus Nerve, descends behind _______, and divides into the External & Internal Branches at the level of ________
The SLN arises from INFERIOR GANGLION of the Vagus Nerve, descends behind INTERNAL CAROTID ARTERY, and divides into the External & Internal Branches at the level of GREATER CORNU OF HYOID BONE
What does the External SLN Branch supply?
Cricothyroid Muscle
What does the Internal SLN Branch supply?
Internal SLN pierces Thyrohyoid Membrane
&
Supplies Sensory Innervation to Larynx & Hypopharynx
What does the RLN Innervate?
Vocal Folds
&
Trachea
What does the Cervical Plexus Innervate?
Muscles, Joints, and Skin of Anterior Neck
&
Ventral Rami C1 - C4
Label 1 - 6 of the Superficial Branches of the Cervical Plexus

- Lesser Occipital Nerve
- Great Auricular Nerve
- Midpoint - Posterior Border of Sternocleidomastoid & Site of Infiltration
- Transverse Cervical Nerve
- Accessory Nerve
- Supraclavicular Nerve

The Brachial Plexus extends from the ______ through ______ and Innervates the ________
The Brachial Plexus extends from the NECK through AXILLA and Innervates the UPPER EXTREMITY
What is the Brachial Plexus composed of?
Ventral Rami (Roots) - 5
Trunks - 3
Divisions - 6
Cords - 3
Branches - 4
Where are the Roots, Trunks, and Division of the Brachial Plexus found?
Posterior Triangle of Neck (Supraclavicular)
Where are the Cords & Branches of the Brachial Plexus found?
Axilla (Infraclavicular)
Know the Brachial Plexus


Where are the 5 Rami (Roots) of the Brachial Plexus found?
From Lateral Foramina to Lateral Border of Scalene Muscles
C5-T1 (C4-T2)
How are the 3 Trunks of the Brachial Plexus divided?
Superior: C5-C6
Middle: C7
Inferior: C8-T1
Where is the Interscalene Space?
Within Fascial Sheath Between Anterior & Middle Scalene Muscle
Where are the Divisions of the Brachial Plexus?
Posterior to Clavicle
What do the Divisions of the Brachial Plexus divide into?
3 Ventral Anterior: Supplies Flexor
&
3 Dorsal Posterior: Supplies Extensor
Where are the Cords of the Brachial Plexus found?
Axilla
How are the Cords of the Brachial Plexus divided?
3 Dorsal: Posterior Cord
&
3 Ventral: Lateral & Medial Cords
Where are the Branches of the Brachial Plexus found?
Lateral Border of Pectoralis Minor
What is the Posterior Cord of the Brachial Plexus made of?
Axillary & Radial Nerve
What are the Lateral Cords of the Brachial Nerves made of?
Musculocutaneous Nerve
&
Lateral Median Nerve
What is the Medial Cord of the Brachial Plexus made of?
Medial & Ulnar Nerve
Where is the Axillary Nerve located?
From C5-C6 and goes to the Shoulder, Posterior to the Humerus Neck
What does the Axillary Nerve Innervate?
Shoulder Ligaments, Capsule, Synovial Membrane
&
Deltoid Skin
Where is the Radial Nerve?
C5-T1 to the Arm and goes down the shaft of the Humerus
then crosses Elbow anterior to Lateral Epicondyle
What does the Inferior Lateral Branch of the Radial Nerve innervate?
Posterior Arm
What does the Posterior Antebrachial Branch of the Radial Nerve innervate?
Posterior Surface of Forearm
What does the Radial Nerve divide into once it crosses the Elbow?
Superficial Branch
&
Deep Branch
What does the Superficial Branch of the Radial Nerve innervate?
Dorsum of Hand onto Thumb
Index Finger
Middle Finger
Ring Finger
What does the Deep Branch of the Radial Nerve innervate?
Muscles of Wrist & Hand
What is the Motor response to Radial Nerve Stimulation?
Wrist Extension
Metacarpo-Phalangeal Extension
Thumb ABduction
Where is the Musculocutaneous Nerve?
C5-C7 –> pierces thru coracobrachialis muscle and goes down between
Brachialis & Biceps Brachii Muscle
Where does the Musculocutaneous Nerve become the Lateral Antebrachial Cutaneous Nerve?
At Elbow
What is the Motor Response to Musculocutaneous Nerve Stimulation?
Biceps Flexion
Where is the Median Nerve?
C5-T1 –> goes down arm w/ Brachial Artery –> crosses Cubital Fossa –> goes into Forearm via Carpel Tunnel
What does the Median Nerve innervate?
Muscles and Skin of Forearm, Wrist, Fingers, Thumb
What is the Motor response to Median Nerve Stimulation?
Wrist Flexion
Finger Flexion
Thumb Opposition
Where is the Ulnar Nerve?
C8-T1 –> goes down w/ Brachial Artery –> Crosses Elbow to Posterior Medial Epicondyle –> continues down Forearm
What does the Ulnar Nerve innervate?
Muscles of Wrist, Fingers, and Thumb
&
Skin of Dorsal & Medial Hand + Ring & Little Finger
What is the Motor response to Ulnar Nerve stimulation?
Ulnar Wrist Deviation
Finger Flexion
Thumb ADDuction
What forms the Lumbosacral Plexus?
Ventral Rami L1 - S5 (+ T12)
What does the Lumbosacral Plexus innervate?
Lower Abdomen
&
Lower Extremities
Where is the Iliohypogastric Nerve?
T12 - L1 –> Abdominal Wall to Symphysis Pubis
What does the Iliohypogastric Nerve innervate?
Parietal Peritoneium
&
Abdominal & Butt Muscle & Skin
What forms the Ilioinguinal Nerve?
T12 - L1 –> Abdominal Wall –> Inguinal Canal & Ring –> Scrotum/Labia Majora
What does the Ilioinguinal Nerve innervate?
Parietal Peritonium
Superior & Medial Thigh Skin
External Genitalia
What forms the Genitofemoral Nerve?
L1 - L1 –> Abdomen -> Inguinal Canal & Ring –> Scrotum/Labia Majora
What does the Genitofemoral Nerve innervate?
Femoral Hiatus Skin
&
Scrotum/Labia Majora Skin
Where is the Pudendal Nerve?
S2 - S4 –> Pelvis -> Perineum
What does the Pudendal Nerve innervate?
Perineum Muscle & Skin
Where is the Lateral Femoral Cutaneous Nerve?
Posterior L2 - L3
What does the Lateral Femoral Cutaneous Nerve innervate?
Lateral Thigh Skin @ Knee Level
Where is the Posterior Femoral Cutaneous Nerve?
Anterior & Posterior S1 - S3
What does the Posterior Femoral Cutaneous Nerve innervate?
Posterior thigh Skin from Hip to Mid-Calf
Where is the Obturator Nerve?
Anterior L2 - L4
What does the Obturator Nerve innervate?
Thigh Muscles
&
Hip Movement
Where is the Femoral Nerve?
Posterior L2 - L4 –> Anterior Thigh –> Divdes to Anterior & Posterior below Inguinal Ligament
Where does the Femoral Nerve sit at the Femoral Crease from Lateral to Medial?
NAVEL
Nerve, Artery, Vein, Empty Space, Ligament
Which muscles does the Femoral Nerve innervate?
Rectus Femoris
Vastus Lateralis
Vastus Intermedius
Vastus Medialis
Sartorious
What does the Saphenous Nerve innervate?
Medial Leg from Knee to Foot Arch
What happens with Saphenous Nerve Stimulation?
Sartoriuos Muscle Contraction (Across Thigh)
&
Patellar Twitch
What forms the Sciatic Nerve?
Tibial Nerve L4 - S3
&
Common Peroneal Nerve L4 - S2
What does the Sciate Nerve innervate?
Hip Extension
&
Knee Flexion
Where is the Tibial Nerve?
Anterior L4 - S3
What does the Tibial Nerve branch into?
Medial & Plantar Nerve: Innervates Plantar Foot
The Common Peroneal Nerve divides into _______ & _______ branches
The Common Peroneal Nerve divides into SUPERFICIAL & DEEP branches
What forms the Sural Nerve?
Tibial & Common Peroneal Nerve
What does the Sural Nerve innervate?
Posterior Foot Sole
Posterior Heel
Achilles Tendon above Ankle
What happens to the foot with Tibial Nerve stimulation?
Plantar Flexion
&
Foot Inversion
What happens with the foot with Superficial Peroneal Nerve stimulation?
Foot ABduction & Eversion
What happens to the foot with Deep Peroneal Nerve stimulation?
Foot Dorsiflexion