OriginPosterior cord of brachial plexus (C5-C6)InnervationMotor – deltoid muscle, teres minor muscle, lateral head of the triceps brachii muscle Sensory – glenohumeral joint, skin of the deltoid region/upper armClinical relationsNeuropathy, quadrangular space syndrome

What muscles does the axillary nerve innervate?

The axillary nerve supplies three muscles in the arm: deltoid (a muscle of the shoulder), triceps (long head) and teres minor (one of the rotator cuff muscles). The axillary nerve also carries sensory information from the shoulder joint.

What muscles are in the axillary region?

The axilla is filled with adipose (fat) and allows passage for: vessels, nerve plexus, lymphatics, and muscles. The muscles include the coracobrachialis, pectoralis minor, and the biceps brachii. The posterior border of pectoralis major and minor defines the anterior border (fold).

How many muscles does the axillary nerve innervate?

The axillary nerve’s primary purpose is to supply nerve function to the shoulder joint and three muscles in the arm, but it also innervates some skin in that region, as well.

Which nerve Innervates the deltoid muscle?

After exiting the quadrangular space posteriorly, the anterior branch of the axillary nerve wraps around the surgical neck of the humerus, with the posterior humeral circumflex artery, to then innervate the deltoid muscle.

Which muscles contribute to form the anterior border of the axilla?

The pectoralis major and minor muscles make up the anterior wall. The clavicle, scapula, and first rib comprise the superior wall. The posterior wall is the teres major, subscapularis, and latissimus dorsi muscles.

What muscles does the radial nerve innervate?

• Abductor pollicis longus.
• Anconeus.
• Brachioradialis.
• Extensor carpi radialis brevis.
• Extensor carpi radialis longus.
• Extensor carpi ulnaris.

What muscles does the Suprascapular nerve innervate?

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

Which muscles can entrap the brachial plexus and axillary artery?

The pectoralis minor muscle may refer pain to the anterior deltoid region or to the ulnar side of the arm, hand, and fingers and may entrap the axillary artery and brachial plexus to mimic cervical radiculopathy (Simons et al 1999).

What does ulnar nerve innervate?

The ulnar nerve innervates the flexor muscles of the forearm including the flexor carpi ulnaris and flexor digitorum profundus. It also innervates the intrinsic muscles of the hand including the palmaris brevis, lumbricals, hypothenar and interossei muscles.

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Is axillary anterior or posterior?

The axillary apex is the interval between the superior border of the scapula, the posterior border of the clavicle, and the external border of the first rib. The pectoralis major and the latissimus dorsi form the major anterior and posterior folds, respectively, of the axilla.

What is muscle under armpit called?

Pectoralis minor is a thin, triangular muscle located beneath the pectoralis major. … The pectoral fascia is a thin layer of tissue over the pectoralis major, extending toward the latissimus dorsi muscle on the back. Along with the pectoralis major and pectoralis minor, the subclavius muscle forms the axilla or armpit.

What part of the body is the axillary region?

The axilla is an anatomical region under the shoulder joint where the arm connects to the shoulder. It contains a variety of neurovascular structures, including the axillary artery, axillary vein, brachial plexus, and lymph nodes.

What are the 3 deltoid muscles?

• Anterior deltoids: The front delts that help move your arm forward. They connect to your clavicle. …
• Lateral deltoids: Side delts that help move your arm out to the side, as well as up and down. …
• Posterior deltoids: Rear delts that help move your arm backward.

Which Plexus Innervates muscles of the neck?

The cervical plexus, composed of the anterior rami of C1 to C4 cervical roots, innervates most neck muscles and provides sensory innervation to the anterior and lateral neck.

Is the axillary nerve motor or sensory?

Innervation. The axillary nerve is mixed. The motor branches innervate the deltoid muscle and the teres minor muscle. The sensory branch innervates the skin over the deltoid region and the upper and lateral part of the arm.

What nerve Innervates the wrist flexors?

The ulnar nerve delivers motor innervation to the flexor carpi ulnaris and the ulnar half of the flexor digitorum profundus. [12] The nerve travels posteriorly and enters the forearm through the cubital tunnel. Dorsal and palmar cutaneous nerves branch off the ulnar nerve, roughly 5 cm proximal to the wrist.

What does the femoral nerve innervate?

The femoral nerve is a mixed nerve of the lower limb that innervates the muscles and skin of the hip and thigh. … They innervate the flexors of the hip (pectineus, iliacus, sartorius) and the extensors of the knee (quadriceps femoris).

Which muscle group is innervated primarily by the median nerve?

Which muscle group is innervated primarily by the median nerve? The median nerve innervates all of the flexor muscles in the forearm except for flexor carpi ulnaris and the medial half of flexor digitorum profundus.

Which muscle can be palpated at the anterior border of the axillary space?

The pectoralis minor is triangular in shape and is located under the pectoralis major, and both form the anterior wall of the axilla. The shortened , tight muscle can be easily palpated there.

What muscles attach to lateral border of scapula?

MuscleDirectionRegionInfraspinatusorigininfraspinous fossaTeres Minororiginlateral borderTeres Majororiginlateral borderLatissimus Dorsi (a few fibers, attachment may be absent)origininferior angle

What is latissimus dorsi muscle?

Introduction. The latissimus dorsi muscle is a broad, flat muscle that occupies the majority of the lower posterior thorax. The muscle’s primary function is of the upper extremity but is also considered to be a respiratory accessory muscle.

What muscles are innervated by the posterior cord of the brachial plexus?

NameRootsSuppliesradial nerveC5-C8, T1triceps brachii muscle, the brachioradialis muscle, the extensor muscles of the fingers and wrist (extensor carpi radialis muscle), supinator, and the extensor and abductor muscles of the thumb

What causes Klumpke's palsy?

Klumpke paralysis is caused by an injury to the nerves of the brachial plexus that which may result during birth due to a a difficult delivery. This injury can cause a stretch injury (neuropraxia), scarring, or tearing of the brachial plexus nerves.

Which one of these muscles is a posterior muscle of the shoulder girdle?

Muscles That Position the Pectoral Girdle The posterior muscles include the trapezius, rhomboid major, and rhomboid minor.

Does Infraspinatus abduct?

Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension. With the arm fixed, it abducts the inferior angle of the scapula.

What Innervates the levator scapulae?

The levator scapulae muscle is innervated by contributions from C3 and C4 rami. The nerves emerge from beneath the posterior border of the sternocleidomastoid to travel caudally into the posterior cervical triangle.

What Innervates the Subclavius muscle?

The subclavius is innervated by the subclavian nerve (C5-6), a small branch that arises from the superior trunk of brachial plexus.

How many muscles are innervated by the ulnar nerve?

The deep branch of the ulnar nerve innervates the three hypothenar muscles, the two medial lumbricals, the seven interrosei, the adductor pollicis and the deep head of the flexor pollicis brevis. It supplies all intrinsic hand muscles which lie medial to the flexor pollicis except the last lateral two lumbricals.

What muscle compartment does the tibial nerve innervate?

In addition to the two heads of the gastrocnemius muscle, the tibial nerve innervates the plantaris, soleus, popliteus, posterior tibialis, flexor digitorum longus, and flexor hallucis longus muscles (Fig. 1).

Which nerve innervates the muscles of the posterior compartment of the forearm?

They are mainly supplied by the posterior interosseous branch of the radial nerve. Blood supply is from the radial recurrent, posterior, anterior interosseous and interosseous recurrent arteries.