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Humerus

 
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The humerus is a long bone
Long bone

The long bones are those that are longer than they are wide, and grow primarily by elongation of the diaphysis, with an epiphysis at the ends of the growing bone....
 in the arm
Arm

In anatomy, an arm is one of the upper limbs of an animal. The term arm can also be used for analogous structures, such as one of the paired upper limbs of a four-legged animal, or the cephalopod arm....
 or forelimb
Forelimb

A forelimb is an anterior Limb on an animal's body. When referring to quadrupeds , the term foreleg is often instead used.The term is not to be confused with the forearm, which refers to a segment of the arm between the Elbow-joint and the wrist....
 that runs from the shoulder
Shoulder

In human anatomy, the shoulder joint comprises the part of the body where the humerus attaches to the scapula. The shoulder refers to the group of structures in the region of the joint....
 to the elbow
Elbow

The elbow is the region surrounding the elbow-joint—the ginglymus or hinge joint in the middle of the arm. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna of the forearm....
. Anatomically, it connects the scapula
Scapula

In anatomy, the scapula, omo, or shoulder blade, is the bone that connects the humerus with the clavicle .The scapula forms the posterior part of the shoulder girdle....
 and the ulna
Ulna

The ulna is a long bone, prism atic in form, placed at the Anatomical terms of location#Relative directions side of the forearm, parallel with the radius ....
, and consists of the following three sections:








most common type of shoulder dislocation is an anterior or inferior dislocation of the humerus of the glenohumeral joint
Glenohumeral joint

The glenohumeral joint, commonly known as the shoulder joint, is a multiaxial synovial joint ball and socket joint and involves articulation between the glenoid cavity of the scapula and the head of the humerus ....
. This dislocation has the potential to injure the axillary nerve
Axillary nerve

The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla and carries nerve fibers from C5 and C6....
 or axillary artery
Axillary artery

In human anatomy, the axillary artery is a large blood vessel that conveys oxygenated blood to the lateral aspect of the thorax, the axilla and the upper limb....
.






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The humerus is a long bone
Long bone

The long bones are those that are longer than they are wide, and grow primarily by elongation of the diaphysis, with an epiphysis at the ends of the growing bone....
 in the arm
Arm

In anatomy, an arm is one of the upper limbs of an animal. The term arm can also be used for analogous structures, such as one of the paired upper limbs of a four-legged animal, or the cephalopod arm....
 or forelimb
Forelimb

A forelimb is an anterior Limb on an animal's body. When referring to quadrupeds , the term foreleg is often instead used.The term is not to be confused with the forearm, which refers to a segment of the arm between the Elbow-joint and the wrist....
 that runs from the shoulder
Shoulder

In human anatomy, the shoulder joint comprises the part of the body where the humerus attaches to the scapula. The shoulder refers to the group of structures in the region of the joint....
 to the elbow
Elbow

The elbow is the region surrounding the elbow-joint—the ginglymus or hinge joint in the middle of the arm. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna of the forearm....
. Anatomically, it connects the scapula
Scapula

In anatomy, the scapula, omo, or shoulder blade, is the bone that connects the humerus with the clavicle .The scapula forms the posterior part of the shoulder girdle....
 and the ulna
Ulna

The ulna is a long bone, prism atic in form, placed at the Anatomical terms of location#Relative directions side of the forearm, parallel with the radius ....
, and consists of the following three sections:
  • Upper extremity of humerus
    Upper extremity of humerus

    The upper extremity of the humerus consists of a large rounded head joined to the body by a constricted portion called the neck, and two eminences, the greater and lesser tubercles....
  • Body of humerus
    Body of humerus

    The body or shaft of the humerus is almost cylindrical in the upper half of its extent, prismatic and flattened below, and has three borders and three surfaces....
  • Lower extremity of humerus
    Lower extremity of humerus

    The lower extremity of the humerus is flattened from before backward, and curved slightly forward; it ends below in a broad, articular surface, which is divided into two parts by a slight ridge....


Humerus

  • The deltoid
    Deltoid

    Deltoid can refer to:* The deltoid muscle, a muscle in the shoulder* Kite , also known as a deltoid, a type of quadrilateral* A deltoid curve, a three-sided hypocycloid...
     originates on the lateral third of the clavicle
    Clavicle

    In human anatomy, the clavicle or collar bone is classified as a flat bone that makes up part of the shoulder girdle . It receives its name from the Latin clavicula because the bone rotates along its axis like a key when the shoulder is Abduction ....
    , acromion and the spine
    Spine

    Spine or Spinal may refer to:...
     of the scapula
    Scapula

    In anatomy, the scapula, omo, or shoulder blade, is the bone that connects the humerus with the clavicle .The scapula forms the posterior part of the shoulder girdle....
    , it is inserted on the deltoid tuberosity
    Deltoid tuberosity

    The deltoid tuberosity is the region on the shaft of the humerus to which the deltoid muscle attaches....
     of the humerus and has several actions including abduction, extension, and rotation.


  • Pectoralis major, teres major and latissimus dorsi, insert at the intertubercular groove of the humerus. They work to adduct and medially rotate the humerus.


  • Biceps brachii, brachialis, coracobrachialis, and brachioradialis
    Brachioradialis

    Brachioradialis is a muscle of the forearm that acts to flex the forearm at the elbow. It is also capable of both pronation and supination, depending on the position of the forearm....
     (which attaches distally) act to flex the elbow. The biceps, however, does not attach to the humerus.


  • Triceps brachii and anconeus extend the elbow, and attach to the posterior side of the humerus.


The axillary nerve

The most common type of shoulder dislocation is an anterior or inferior dislocation of the humerus of the glenohumeral joint
Glenohumeral joint

The glenohumeral joint, commonly known as the shoulder joint, is a multiaxial synovial joint ball and socket joint and involves articulation between the glenoid cavity of the scapula and the head of the humerus ....
. This dislocation has the potential to injure the axillary nerve
Axillary nerve

The axillary nerve is a nerve of the human body, that comes off the posterior cord of the brachial plexus at the level of the axilla and carries nerve fibers from C5 and C6....
 or axillary artery
Axillary artery

In human anatomy, the axillary artery is a large blood vessel that conveys oxygenated blood to the lateral aspect of the thorax, the axilla and the upper limb....
. Signs and symptoms of this dislocation include a loss of the normal shoulder contour and a palpable depression under the acromion.

The Ulnar Nerve

The ulnar nerve
Ulnar nerve

In human anatomy, the ulnar nerve is a nerve which runs near the ulna bone. The ulnar nerve is the largest unprotected nerve in the human body , and the only unprotected nerve that does not serve a purely sensory function ....
 at the distal end of the humerus near the elbow is sometimes referred to in popular culture as 'the funny bone'. Striking this nerve can cause a tingling sensation ("funny" feeling), and sometimes a significant amount of pain.

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