Flexor Pollicis Brevis Muscle Anatomy The flexor pollicis brevis is a muscle in the hand that flexes the thumb. It is one of three thenar muscles. It has both a superficial part and a deep part. There are two heads in the flexor pollicis brevis: superficial and deep. The deep head, though, can vary in…
Abductor Pollicis Brevis Muscle Anatomy The abductor pollicis brevis is a flat, thin muscle located just under the skin. It is a thenar muscle and therefore contributes to the bulk of the palm’s thenar eminence. Origin It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from…
Flexor pollicis longusMuscle Anatomy The flexor pollicis longus is a long muscle of the forearm. It belongs to the deep flexors of the forearm, along with the flexor digitorum profundus and pronator quadratus. Since it lies in the forearm but is inserted in the hand, it is also classified as an extrinsic muscle of the…
Flexor digitorum profundus Muscle Anatomy Human forearm muscles called the flexor digitorum profundus are responsible for flexing the fingers, or digits. Because its muscle belly is located in the forearm and it operates on the hand, it is regarded as an extrinsic hand muscle. This muscle connects the distal phalanges of the second to fifth…
Flexor Carpi Ulnaris Muscle Anatomy Flexor carpi ulnaris is a fusiform muscle located in the anterior compartment of the forearm. It belongs to the superficial flexors of the forearm. It is the most medial of the superficial flexors. It is the strongest wrist flexor available. The tendinous arch that connects the two distinct heads of…
Flexor digitorum superficialis Muscle Anatomy Flexor Digitorum Superficialis is in the anterior compartment of the forearm. It is sometimes considered to be the deepest part of the superficial layer of this compartment. Origin It has 2 heads, Insertion It inserts via the four tendons attaching to the anterior surface of the middle phalanx of digits…
Palmaris longus Muscle Anatomy The palmaris longus is a muscle visible as a small tendon between the flexor carpi radialis and the flexor carpi ulnaris, although it is not always present. About 14% of people do not have it; however, communities of African, Asian, and Native American people may have different percentages. Grip strength is…
Flexor Carpi Radialis Muscle Anatomy The flexor carpi radialis muscle is a relatively thin muscle located on the anterior part of the forearm. Origin It originates from the medial epicondyle of the humerus. Insertion It inserts on the anterior aspect of the base of the second metacarpal, and has small slips to both the third…
Pronator teres Muscle Anatomy The pronator teres muscle is located on the palmar side of the forearm, below the elbow. It is a fusiform muscle found in the anterior forearm. It can be found on the front of the forearm and is a long, spherical muscle. The humeral head and the ulnar head are the…
Brachialis Muscle Anatomy The brachialis (brachialis anticus) is a muscle in the upper arm that flexes the elbow joint. It is the prime mover of elbow flexion. The brachialis actually generates about 50% more power and is thus the prime mover of elbow flexion. The brachialis is deeper than the biceps brachialis muscle and is…
