humerus

(noun)

The bone of the upper arm.

Related Terms

Examples of humerus in the following topics:

  • Humerus (The Upper Arm)

    • The humerus is a bone in the upper arm.
    • Distally, the humerus articulates with the radius and ulna to form the elbow joint.
    • The proximal portion of the humerus can be divided into three parts.
    • Finally, the greater and lesser tubercles are found at the most superior end of the main shaft of the humerus.
    • Distally, the humerus flattens to articulate with the ulna and radius at the elbow joint.

  • Muscles of the Humerus that Act on the Forearm

    • Humerus that act on the forearm are primarily involved in flexion and extension.
    • The humerus is a long bone in the arm that runs from the shoulder to the elbow.
    • Attachments - Originates from the scapula and attaches to the humerus.
    • Attachments - Originates from the humerus and attaches to the ulna.
    • Diagram the movements of the humerus muscles that act on the forearm

  • Muscles of the Shoulder

    • The shoulder or glenohumeral joint is a ball and socket joint formed between the humerus and scapula.
    • The muscle converges into a tendon attaching to the humerus.
    • Intrinsic muscles originate from the scapula or clavicle and attach to the humerus.
    • Attachments – Originates from the posterior of the scapula and attaches to the humerus.
    • Both attach to the humerus.

  • Scapula

    • The scapula, or shoulder bone, is a flat, triangular bone that connects to the humerus and the clavicle.
    • The scapula also articulates with the humerus of the upper arm to form the shoulder joint, or glenohumeral joint, at the glenoid cavity.

  • Ulna and Radius (The Forearm)

    • The forearm contains two bones—the radius and the ulna—that extend in parallel from the elbow, where they articulate with the humerus to the wrist, where they articulate with the carpals.
    • The cornoid process, together with the olecranon, forms the trochlear notch where it articulates with the trochlea of the humerus.
    • Proximally, the radius terminates with a disk-shaped head that articulates with the capitulum of the humerus and the radial notch of the ulna.

  • Muscles of the Wrist and Hand

    • Attachments - Originates from the humerus and attaches to the base of the hand.
    • Attachments - Originates from the humerus and attaches to the base of the digits.
    • Attachments - Originates from the humerus and attaches to the ulna.
    • Attachments - Originates from the humerus and attaches to the little finger.
    • Attachments - Originates from the humerus and attaches to the base of the hand.

  • Human Appendicular Skeleton

    • The humerus is the largest and longest bone of the upper limb and the only bone of the arm.
    • The radius, located along the lateral (thumb) side of the forearm, articulates with the humerus at the elbow.
    • It articulates with the humerus at the elbow.
    • The upper limb consists of the humerus of the upper arm, the radius and ulna of the forearm, eight bones of the carpus, five bones of the metacarpus, and 14 bones of the phalanges.

  • Rotator Cuff Injury and Dislocated and Separated Shoulder

    • The main functions of the cuff are to stabilize the glenohumeral joint and rotate the humerus outward.
    • In a typical case of a dislocated shoulder, a strong force that pulls the shoulder outward (abduction) or extreme rotation of the joint pops the ball of the humerus out of the shoulder socket.
    • Doctors treat a dislocation by putting the head of the humerus back into the joint socket (glenoid fossa) of the scapula.
    • X-ray of a complete tear of the supraspinatus resulting in a shift upwards of the head of the humerus.

  • The Appendicular Skeleton

    • Upper arms and forearms (6 bones) - Left and right humerus (upper arm, 2), ulna (2) and radius (2) (forearm)
    • The three regions of the upper limb arm (humerus), forearm (ulna medially and radius laterally), and the hand.

  • Lever Systems

    • The force is applied at its point of insertion on the ulna in the forearm, the elbow is the pivot, and the load is the humerus in the upper arm.
    • Internal rotation can also move the humerus and femur inward.
    • External or lateral rotation is the opposite movement, pointing the distal portion of limbs as well as the humerus and femur away from the mid-line.