What nerve innervates the pectoralis muscles?
The pectoralis major receives dual motor innervation by the medial pectoral nerve and the lateral pectoral nerve, also known as the lateral anterior thoracic nerve. The sternal head receives innervation from the C7, C8 and T1 nerve roots, via the lower trunk of the brachial plexus and the medial pectoral nerve.
What is the innervation of pec major?
What plexus Innervates the pectoralis major?
The lateral and medial pectoral nerves, which branch off the brachial plexus, innervate the pectoralis major. They course between the pectoralis major and minor muscles after branching from the brachial plexus.
What is pectoralis minor innervated by?
medial pectoral nerve
Innervation. The primary nerve supply to the pectoralis minor muscle comes via the medial pectoral nerve (C8, T1), one of the minor branches of the brachial plexus that arises from the cervical portion of the spinal cord.
What muscles are innervated by Musculocutaneous nerve?
The musculocutaneous nerve innervates the three muscles of the anterior compartment of the arm: the coracobrachialis, biceps brachii, and brachialis. It is also responsible for cutaneous innervation of the lateral forearm.
What is innervated by the medial pectoral nerve?
The medial pectoral nerve supplies both the pectoralis minor muscle and sternocostal portions of the pectoralis major muscle.
What is latissimus dorsi innervated by?
thoracodorsal nerve
The thoracodorsal nerve is a pure motor nerve that innervates the latissimus dorsi muscle. The latissimus dorsi muscle is a large, fan-shaped muscle that originates from the spinous processes of T7 to L5, the thoracolumbar fascia, and iliac crest.
What Innervates the triceps?
Nerve. All the three heads of triceps brachii are innervated by the four branches of the radial nerve (C7, C8). Some research reveals that the long head of triceps is actually innervated by the axillary nerve.
What is in the Deltopectoral triangle?
The deltopectoral triangle is a triangular depression formed between the clavicle above, lateral border of the pectoralis major medially and the medial border of the deltoid laterally. This narrow triangular area contains investing layers of the clavipectoral fascia and the cephalic vein on its roof which it pierces.
What is the pectoralis minor function?
The primary actions of this muscle include the stabilization, depression, abduction or protraction, internal rotation and downward rotation of the scapula. It elevates the ribs for deep inspiration when the pectoral girdle is fixed or elevated.
What is innervated by the ulnar nerve?
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.
Where does the innervation of the pectoralis muscle come from?
The pectoralis major muscle is innervated by the lateral and medial pectoral nerves (root value C5-T1), which stem from the brachial plexus.
Where is the pectoralis major located in the body?
The pectoralis major is a paired, superficial muscle located on the anterior surface of the thoracic cage. If you’re a gym lover, you’ll hear these muscles also being referred to as the pecs muscles. The pectoralis major has a broad origin, based on which it is divided into three parts: clavicular part, sternocostal part and abdominal part.
Where does the pectoralis muscle insert into the scapula?
The muscle extends superolaterally to form a flat tendon, which inserts into the medial border and coracoid process of scapula. Some anatomic variation is seen in the orgin of the muscle.
Which is the ventral view of the pectoralis?
Ventral View – Pectoral Girdle Note the Pectoralis Minoris called Pectoralis Profundushere. The Pectoralis Majoris labeled Pectoralis Transversus, and the pectoantebrachialisis labeled Pectoralis Descendens. Ventral View – Head and Neck Muscles Lateral View – Head and Neck Muscles Ventral View – Pectoral Girdle