3.2.2. The Ulnar Nerve Flashcards
Which Cord does the Ulnar Nerve arise from?
Medial Cord of the Brachial Plexus
What does the Ulnar Artery descend alongside?
Brachial Artery
Which side of the Brachial Artery does the Ulnar Nerve descend alongside?
Medial Side
Which compartment does the Ulnar Nerve enter?
Posterior Compartment
How does the Ulnar Nerve enter the Posterior Compartment?
Through the Medial Intermuscular Septum
Where does the Ulnar Nerve travel in the Upper Arm?
- It runs along the Medial Head of the Tricep Brachii
2. It runs to the back of the Medial Epicondyle
Does the Ulnar Nerve innervate any Muscles in the Upper Arm?
No - Only the Forearm and Below
How does the Ulnar Nerve enter into the Forearm?
Pierces the 2 Heads of the Flexor Carpi Ulnaris
Where does the Ulnar Nerve travel in the Forearm?
Alongside the Ulna
How many Branches of the Ulnar Nerve Arise in the Forearm?
3
What are the Branches of the Ulnar Nerve Arise in the Forearm?
- Muscular Branch of the Ulnar Nerve
- Palmar Cutaneous Branch of the Ulnar Nerve
- Dorsal Cutaneous Branch of the Ulnar Nerve
Where does the Ulnar Nerve travel at the Wrist?
Superficially to the Flexor Retinaculum
How does the Ulnar Nerve enter into the Hand?
Via the Ulnar Canal
What is the Ulnar Canal also known as?
Guyon’s canal
What happens to the Ulnar Nerve in the Hand?
It Terminates, Bifurcating into 2 Nerves
What are the Nerves the Ulnar Nerve Bifurcates into, as it Terminates?
- Superficial Branches of the Ulnar Nerve
2. Deep Branches of the Ulnar Nerve
Where does the Ulnar Nerve innervate Muscles?
- Anterior Compartment of the forearm
2. Hand
What Muscles in the Anterior Compartment of the Forearm are supplied by the Ulnar Nerve?
- Flexor Carpi Ulnaris
2. Medial Half of the Flexor Digitorum Profundus
What are the functions of the Flexor Carpi Ulnaris?
- Flexes the Hand at the Wrist
2. Adducts the Hand at the Wrist
What is the function of the Medial Half of the Flexor Digitorum Profundus?
Flexion of the Fingers Medial 2 Fingers - Ring and Little Finger
What are the rest of the Muscles of the Anterior Compartment of the Forearm supplied by?
The Median Nerve
Which of the Ulnar Nerve Branches (as it Bifurcate) supplies Motor Innervation?
Deep Branches of the Ulnar Nerve
What Muscles of the Hand are innervated by the Deep Branches of the Ulnar Nerve?
- Hypothenar Muscles
- Medial 2 Lumbrical Muscles (Ring and Little Finger)
- Adductor Pollicis
- Interossei of the Hand
- Palmar Brevis
What are the Hypothenar Muscles associated with?
- Medial aspect of the Palm
2. Little finger
What are the other Muscles of the Hand innervated by?
Median Nerve
How many Branches of the Ulnar Nerve are responsible for Sensory Cutaneous Innervation?
3
What are the Branches of the Ulnar Nerve are responsible for Sensory Cutaneous Innervation?
- Palmar Cutaneous Branch of the Ulnar Nerve
- Dorsal Cutaneous Branch of the Ulnar Nerve
- Superficial Branch of the Ulnar Nerve
Which 2 Branches of the Ulnar Nerve are responsible for Sensory Cutaneous Innervation arise in the Forearm?
- Palmar Cutaneous Branch of the Ulnar Nerve
2. Dorsal Cutaneous Branch of the Ulnar Nerve
Which Branches of the Ulnar Nerve are responsible for Sensory Cutaneous Innervation arise in the Hand?
Superficial Branch of the Ulnar Nerve
Which part of the Hand does the Palmar Cutaneous Branch of the Ulnar Nerve, recieve Sensory Information from?
Skin on the Medial Half of the Palm
Which part of the Hand does the Dorsal Cutaneous Branch of the Ulnar Nerve, recieve Sensory Information from?
Skin of the Medial 1 1/2 Fingers, and the associated Dorsal Hand Area
Which part of the Hand does the Superficial Branch of the Ulnar Nerve, recieve Sensory Information from?
Palmar Surface of the Medial 1 1/2 Fingers
What is the relationship of the Ulnar Artery and Ulnar Nerve during their course in the Forearm?
The Ulnar Nerve is Medial to the Ulnar Artery
What is the Segmental (or Root) Value of the Ulnar Nerve?
- C8
2. T1
