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Anatomical Course. The radial nerve then descends down the arm, travelling in a shallow depression within the surface of the humerus, known as the radial groove. As it descends, the radial nerve wraps around the humerus laterally, and supplies a branch to the medial head of the triceps brachii.
It exits the axilla inferiorly (via the triangular interval), and supplies branches to the long and lateral heads of the triceps brachii. The radial nerve then descends down the arm, travelling in a shallow depression within the surface of the humerus, known as the radial groove.
Deep branch (motor) – innervates the muscles in the posterior compartment of the forearm. Superficial branch (sensory) – contributes to the cutaneous innervation of the dorsal hand and fingers. Fig 1 – View of the posterior arm, showing the anatomical course of the radial nerve
During much of its course within the arm, it is accompanied by the deep branch of the brachial artery. To enter the forearm, the radial nerve travels anterior to the lateral epicondyle of the humerus, through the cubital fossa. The nerve then terminates by dividing into two branches:
Course. The radial nerve lies posterior to the axillary artery in the axilla and enters the posterior compartment of the arm under teres major muscle via the triangular interval. In the posterior compartment of the arm, it winds its way around the spiral groove of the humerus, accompanying profunda brachii artery.
Part of the peripheral nervous system, the radial nerve runs down the back of the arm from the armpit to the hand.
The radial nerve is the largest nerve of the upper limb. It originates as the terminal branch of the posterior cord of the brachial plexus. The radial nerve arises in the axillary region and descends down along the posterior surface of the humerus.
humerus boneThe radial sulcus (also known as the musculospiral groove, radial groove, or spiral groove) is a broad but shallow oblique depression for the radial nerve and deep brachial artery. It is located on the center of the lateral border of the humerus bone.
Several major nerves continue from the arm into the forearm, including the radial, median, and ulnar nerves. These nerves control the forearm muscles that move the hands and fingers through tendons that pass through the wrist.
Anatomy of Posterior Interosseous Nerve (PIN) It is a branch of the radial nerve. It passes between the two heads of the supinator and comes to lie intimately with the proximal radius. It then passes over the abductor pollicis longus muscle origin to travel along the posterior interosseous membrane.
Tibia. Femur. The palpable hip bone projections in the front of the body felt when you put your hands on your hips are the posterior inferior iliac spines. Hints. The palpable hip bone projections in the front of the body felt when you put your hands on your hips are the posterior inferior iliac spines.
The acetabulum articulates with the sacrum. The posterior inferior iliac spine is superior to the ischial spine. The posterior inferior iliac spine is superior to the ischial spine. The ischium forms the posteroinferior region of the pelvic girdle. The ischium forms the posteroinferior region of the pelvic girdle.
The scapula is the site of origin of a group of muscles that stabilize the shoulder joint. Identify this muscle group. Hints. Hint 1. (click to open) The scapula is the site of origin of a group of muscles that stabilize the shoulder joint. Identify this muscle group.
glides along the fibular notch on the lateral side of the tibia. is a sesamoid bone enclosed in the tendon of the quadriceps muscle. secures the quadriceps muscles of the anterior thigh to the femur. is a sesamoid bone enclosed in the tendon of the quadriceps muscle.
the head of the radius is medial to the ulna. the ulna is lateral to the radius. the radius is lateral to the ulna. the radius is lateral to the ulna. All of these bones are in the proximal row of four carpal bones except the. All of these bones are in the proximal row of four carpal bones except the.
The radial nerve is a major peripheral nerve of the upper limb. In this article, we shall look at the anatomy of the radial nerve – its anatomical course and its motor and sensory functions.
It therefore contains fibres from nerve roots C5 – T1. The nerve arises in the axilla region, where it is situated posteriorly to the axillary artery.
Motor functions – the triceps brachii and muscles in posterior compartment are affected. The patient is unable to extend at the forearm, wrist and fingers. Unopposed flexion of wrist occurs, known as wrist-drop. Sensory functions – all four cutaneous branches of the radial nerve are affected.
Posterior cutaneous nerve of forearm – Innervates a strip of skin down the middle of the posterior forearm. The fourth branch – the superficial branch – is a terminal division of the radial nerve. It innervates the dorsal surface of the lateral three and half digits and the associated area on the dorsum of the hand.
Injury to the radial nerve can be broadly categorised into four groups – depending on where the damage has occurred (and thus which components of the nerve have been affected).
Sensory – Innervates most of the skin of the posterior forearm, the lateral aspect of the dorsum of the hand, and the dorsal surface of the lateral three and a half digits. Motor – Innervates the triceps brachii and the extensor muscles in the forearm.
The radial nerve is tightly bound within the spiral groove of the humerus. Thus, it is most susceptible to damage with a fracture of the humeral shaft. Motor functions. The triceps brachii may be weakened, but is not paralysed (branches to the long and lateral heads of the triceps arise proximal to the radial groove).