3.2.1. The Median Nerve Flashcards
What is the Median Nerve?
A Major Peripheral Nerve of the Upper Limb
Where does the Median Nerve arise?
In the Axilla
What does the Median Nerve arise from?
- Medial Cord of the Brachial Plexus
2. Lateral Cord of the Brachial Plexus
What is the Segmental (or Root) Value of the Median Nerve?
- C5
- C6
- C7
- C8
- T1
Where does the Median Nerve travel in the Upper Arm?
- Descends along the Lateral Side of the Axillary Artery and Upper Part of the Brachial Artery
- Crosses to the Medial side of the Brachial Artery
- Enters the Cubital Fossa
Does the Median Nerve supply any Muscles in the Upper Arm?
No, nothing above the Forearm
Where does the Median Nerve travel between in the Forearm?
- Flexor Digitorum Profundus
2. Flexor Digitorum Superficialis
How many Branches does the Median Nerve give off in the Forearm?
2
What are the Branches the Median Nerve gives off in the Forearm?
- Anterior Interosseous Nerve
2. Palmar Cutaneous Nerve
How does the Median Nerve travel to enter into the Hand?
Via the Carpal Tunnel
What happens to the Median Nerve as it enters into the Hand?
It Terminates, Bifurcating into 2 Nerves
What are the Nerves the Median Nerve Bifurcates into as it Terminates?
- Recurrent Branch of the Median Nerve
2. Palmar Digital Branch of the Median Nerve
Does the Median Nerve transmit:
- Motor Information?
- Sensory Information?
- Yes
2. Yes
What Muscle Groups does the Median Nerve Supply?
- Majority of the Muscles of the Anterior Compartment of the Forearm
- Some Intrinsic Muscles of the Hand
What Muscles Groups does the Median Nerve directly innervate in the Anterior Compartment of the Forearm?
- Superficial Muscles of the Anterior Forearm
2. Intermediate Muscles of the Anterior Forearm
What are the Superficial Muscles of the Anterior Forearm, supplied by the Median Nerve?
- Palmaris Longus
- Flexor Carpi Radialis
- Pronator Teres
What is the Intermediate Muscle of the Anterior Forearm, supplied by the Median Nerve?
Flexor Digitorum Superficialis
What Motor Nerve Branches off of the Median Nerve in the Forearm?
Anterior Interosseous Branch of the Median Nerve
What Muscle Group does the Anterior Interosseous Branch of the Median Nerve innervate?
Deep Muscles of the Anterior Compartment of the Forearm
What are the Deep Muscles of the Anterior Forearm, supplied by the Median Nerve?
- Lateral Half of the Flexor Digitorum Profundus
- Flexor Pollicis Longus
- Pronator Quadratus
What is the Medial Half of the Flexor Digitorum Profundus Innervated by?
Ulnar Nerve
What are the general functions of the Forearm Muscles, supplied by the Median Nerve and the Anterior Interosseous Branch of the Median Nerve?
- Pronation of the Forearm
- Flexion of the Wrist
- Flexion of the Digits of the Hand
Which of the Nerves the Median Nerve Bifurcates into as it Terminates, supply Motor Innervation?
- Recurrent Branch of the Median Nerve
2. Palmar Digital Branch of the Median Nerve
What does the Recurrent Branch of the Median Nerve innervate?
Thenar Muscles of the Hand
What are the Thenar Muscles associated with?
Movement of the Thumb
What does the Palmar Digital Branch of the Median Nerve innervate?
Lateral 2 Lumbrical Muscles of the Hand - Index and Middle Fingers
What are the Lateral 2 Lumbrical Muscles of the Hand associated with?
- Flexion of the Metacarpophalangeal Joints of the Index and Middle Fingers
- Extension of the Interphalangeal Joints of the Index and Middle Fingers
Where is the Sensory Information from the Median Nerve recieved from?
Hand
What are the 2 Branches of the Median Nerve which will recieve Sensory Information?
- Palmar Cutaneous Branch of the Median Nerve
2. Palmar Digital Cutaneous Branch of the Median Nerve
Where does the Palmar Cutaneous Branch of the Median Nerve Originate from?
Forearm
Where does the Palmar Cutaneous Branch of the Median Nerve travel?
Into the Hand from the Forearm
Does the Palmar Cutaneous Branch of the Median Nerve travel through the Carpal Tunnel?
No
What is the Clinical Significance of the Palmar Cutaneous Branch of the Median Nerve not travelling through the Carpal Tunnel?
It is Spared in Carpal Tunnel Syndrome
Where does the Palmar Cutaneous Branch of the Median Nerve recieve Sensory Information from?
Lateral Aspect of the Palm
Where does the Palmar Digital Cutaneous Branch of the Median Nerve Originate from?
Hand
Where does the Palmar Digital Cutaneous Branch of the Median Nerve recieve Sensory Information from?
- Palmar Surface of the Lateral 3 1/2 Digits
2. Fingertips of the Lateral 3 1/2 Digits
What is the relationship of the Brachial Artery to the Median Nerve in the Cubital Fossa?
The Median Nerve is Medial to the Brachial Artery
