The wrist extensors are a group of nine individual muscles on the back of the forearm that act on the wrist and fingers.
Collectively, their primary function is wrist
The posterior deltoid (L. posterior, behind ; deltoides, triangular) refers to the rear head of the three-headed deltoid muscle.
It acts on the shoulder joint and is the
The erector spinae (erigere, to erect ; spina, spine.) consists of three long, thin muscle groups running vertically up each side of the vertebral column: the iliocostalis,
The internal oblique (L. internus, internal ; obliquus, oblique.) is a flat sheet of muscle on either the side of the lower torso.
It gets its name from being beneath
The pronator teres (L. pronus, lying face down ; teres, round and long.) is an elongated, cylindrical forearm muscle that crosses the gap between radius and ulna.
The lateral deltoid (L. latus, side ; deltoides, triangular) is the outermost head of the deltoid and is primarily responsible for performing shoulder abduction.
The external oblique (L. externus, external ; obliquus, oblique.) is a broad, flat sheet of muscle on either side of the abs.
It is named after its location (external
The transversus abdominis (L. transversus, crosswise ; abdo, to hide.) is a flat layer of muscle in the abdomen, whose fibers run transverse relative to the midline
The anterior deltoid (L. anterior, before, in front of ; deltoides, triangular) refers to the front head of the deltoid muscle.
This part of the delt is responsible for
Literally meaning the three-headed muscle of the arm, the triceps brachii (L. tres, three ; caput, head ; brachium, arm.) consists of a long, lateral and medial head.