Pectoralis Major Muscle – Attachment, Action & Innervation

Pectoralis major is a thick, fan-shaped muscle contributing to the thoracobrachial motion. It consists of a clavicular part and a sternal part, both converging to a flat tendon that inserts on the humerus. It’s innervated by both medial and lateral pectoral nerves.

Biceps Brachii – Attachments, Action & Innervation

Biceps brachii is one of the main muscles of the upper arm which acts on both the shoulder joint and the elbow joint. It derives its name from the fact that it consists of two parts (heads), both innervated by the musculocutaneous nerve.

Latissimus Dorsi Muscle – Attachments, Action & Innervation

Latissimus Dorsi is one of four muscles responsible for the thoracobrachial motion. It is large, flat and triangular in shape originating from large parts of the lumbar region and lower thorax to insert on the humerus through a narrow tendon.

Frontalis Muscle – Attachments, Actions & Innervation

The frontalis Muscle (Insertion, Origin, Actions & Innervations); explained beautifully in an illustrated and interactive way.

Deltoid Muscle – Anterior and Middle Heads

The Deltoid muscle (derived its name from the Greek letter delta) is a large, triangular muscle occupying the upper arm and the shoulder giving it this rounded shape. The deltoid consists three sets of fibers: anterior, middle, and posterior.

Gluteus Maximus – Attachments, Actions & Innervation

An interactive tutorial featuring the (origin, insertion, innervation, and actions) of Gluteus Maximus featuring GBS iconic illustrations and animations.

Trapezius Muscle

An interactive demonstration of the Trapezius Muscle (Insertion, Origin, Actions & Innervations) featuring the iconic GBS illustrations.

Rectus Femoris Muscle

An interactive tutorial teaching the position, actions, innervation and attachments of the Rectus Femoris muscle with the aid of anatomical illustrations.

Teres Major Muscle – Attachments, Action & Innervation

Teres major is a thick and ovoid muscle in the upper arm. Despite their similar names, Teres major has different actions and innervation from the Teres minor. It’s mainly responsible for the medial rotation of the arm and it also contributes to static posture and arm-swinging.

External Oblique Muscle

An interactive demonstration of the External Oblique Muscle (Insertion, Origin, Actions & Innervations).