Nerve fibers from the anterior division of the brachial plexus are contained in the musculocutaneous, median, and ulnar nerves. These nerves innervate the anterior muscles of the upper arm, forearm, and intrinsic muscles. [10][11][12][11] This innervation mainly provides flexion of the upper limb.

What muscles are innervated by the brachial plexus?

Nerve fibers from the anterior division of the brachial plexus are contained in the musculocutaneous, median, and ulnar nerves. These nerves innervate the anterior muscles of the upper arm, forearm, and intrinsic muscles. [10][11][12][11] This innervation mainly provides flexion of the upper limb.

What is sympathetic innervation of brachial plexus?

The brachial plexus is a complex network of nerves which extends from the neck to the axilla and which supplies motor, sensory, and sympathetic fibers to the upper extremity. Generally it is formed by the union of the ventral primary rami of the spinal nerves, C5-C8 and T1, the so-called “roots” of the brachial plexus.

What muscles are innervated by C2 C3?

The muscular branches pass deeply from the plexus to supply the rhomboids, the serratus anterior, the sternocleidomastoid, the trapezius, levator scapulae, and the scalenus medius. There are also branches that supply the muscles of the suboccipital triangle.

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. The thoracodorsal nerve (C6-C8), which also arises from the posterior cord, innervates the levator scapulae.

What is innervated by the posterior cord of the brachial plexus?

The axillary nerve derives from the posterior cord of the brachial plexus with the radial nerve, and lies in close proximity to the surgical neck of the humerus. The major branches of the axillary nerve include the lateral cutaneous nerve of the arm and motor branches to the deltoid and teres minor muscles (C5–C6).

Is brachial plexus CNS or PNS?

The brachial plexus is a bundle/network of peripheral nerves located in the area of the neck and shoulder. The plexus, also known as a network, begins as 5 nerves in the neck, exiting the spinal cord and contributing to branches (peripheral nerves) that extend into the shoulder, arm, forearm and hand.

What is innervated by C1?

In the cervical spine, there are eight pairs of spinal nerves labeled C1 to C8, which innervate the neck, shoulder, arm, hand, and more.

What muscles are innervated by C3 and C4?

Ansa cervicalis (This is a loop formed from C1-C3 which supplies the four infrahyoid aka strap muscles), etc. ( thyrohyoid (C1 only), sternothyroid, sternohyoid, omohyoid)

  • Phrenic (C3-C5 (primarily C4))-innervates diaphragm and the pericardium.
  • Segmental branches (C1-C4)- innervates anterior and middle scalenes.

    • What Innervates infraspinatus muscle?

    The suprascapular nerve
    The suprascapular nerve branches provide efferent innervation to the supraspinatus and infraspinatus muscles as well as sensory innervation to the shoulder joint.

    What muscles are innervated by C7?

    From the lateral cord, C5, C6, and C7 supply the pectoralis major and minor muscles, via the lateral and medial pectoral nerves, as well as the coracobrachialis, brachialis and biceps brachii, via the musculocutaneous nerve.

    How can I remember my hand innervation?

    Pad Dab (mnemonic)…This mnemonic recalls the intrinsic muscles of the hand in their relative palmar anatomical position from lateral to medial:

    1. A: abductor pollicis brevis.
    2. F: flexor pollicis brevis.
    3. O: opponens pollicis.
    4. A: adductor pollicis.
    5. O: opponens digiti minimi.
    6. F: flexor digiti minimi.
    7. A: abductor digiti minimi.