What is the innervation of the upper limb?
The brachial plexus is a collection of nerve fibres that supply motor and sensory innervation to the upper limb. It originates from nerve roots C5 to T1 and, as it passes through the axilla, merges the nerve fibres from these roots into different nerve branches.
Which nerves supply the muscles of the upper arm?
Brachial plexus. The brachial plexus is a group of nerves that control the muscles of the shoulder, arm, forearm, and hand. These same nerves also provide sensations (feeling) of the whole upper limb. There are five components of the brachial plexus: roots, trunks, divisions, cords, and branches.
Which muscles have dual nerve supply in upper limb?
The composite flexor digitorum profundus muscle has a dual nerve supply from the ulnar nerve (UN) and the anterior interosseous nerve (AIN) but anatomic data regarding the territories of these 2 nerves are limited.
Which muscles are innervated by which nerves?
| Muscles Innervated by Cranial Nerves | |
|---|---|
| Cranial Nerve | Muscle |
| Glossopharyngeal nerve (CN IX) | Stylopharyngeus muscle |
| Vagus nerve (CN X) | Muscles of the palate and pharynx except tensor palati muscle (CN V3) Stylopharyngeus muscle (CN IX) All muscles of the larynx |
| Accessory nerve (CN XI) | Sternocleidomastoid muscle Trapezius muscle |
Which muscles are innervated by C5?
The muscles innervated by C5 are: Serratus Anterior, Deltoid, Ifraspinatus, Teres minor, Teres major, Pectoralis major, Supraspinatus, Biceps, Brachialis, Brachioradialis, Supinator.
What muscles do C5 and C6 innervate?
The lower subscapular nerve (C5-C6) innervates teres major; and both the upper and lower subscapular nerves innervate the subscapularis, the third muscle of the rotator cuff apparatus.
What nerves innervate arm muscles?
The musculocutaneous nerve is responsible for innervating the flexors of the arm, including the biceps brachii, coracobrachialis, and the medial aspect of the brachialis. The radial nerve innervates the triceps brachii, lateral aspect of the brachialis, anconeus, brachioradialis, and extensor carpi radialis longus.
What muscles are innervated by two nerves?
These are the most common muscles with dual innervation.
- Pectoralis Major muscle:
- Subscapularis muscle supplied by the Upper & Lower Subscapular nerve (C5,6) arising from the posterior cord of brachial plexus.
What is the innervation of different muscles?
Each skeletal muscle fiber is innervated by a single motor axon. The same axon may also innervate other muscle fibers. All the fibers innervated by the same axon are called a motor unit.
Which muscles are innervated by C7?
C7 mainly forms the radial nerve to innervate triceps muscle; d. C8 mainly forms the median nerve to innervate the flexor digitorum muscle; e. T1 mainly forms the ulnar nerve to innervate the intrinsic muscles of the hand.
Which muscles are innervated by C3?
The phrenic nerve arises from the anterior rami of C3-C5. It provides motor innervation to the diaphragm….It gives off four muscular branches:
- Superior belly of the omohyoid muscle.
- Inferior belly of omohyoid muscle.
- Sternohyoid.
- Sternothyroid.
What muscles are innervated by C4?
It originates from the spinal cord above the 4th cervical vertebra (C4). It contributes nerve fibers to the phrenic nerve, the motor nerve to the thoracoabdominal diaphragm. It also provides motor nerves for the longus capitis, longus colli, anterior scalene, middle scalene, and levator scapulae muscles.