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Humerus Bone – Introduction

Introduction to Humerus bone anatomy:

  • The image descriptionhumerus is a long bone that supports the upper arm (upper arm bone). It extends from the shoulder joint to the elbow joint.
Humerus Anterior View
Humerus Anterior View
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Anatomy of the Humerus bone:

  • At its image descriptionproximal end, the humerus is attached to the axial skeletal by the shoulder girdle or pectoral girdle, which consists of the scapula and clavicle bones.
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  • The rounded humeral head fits into the glenoid fossa (cavity) of the scapula. This shallow depression on the lateral side of the scapula allows the shoulder joint to be very mobile but also reduces its stability.
  • image descriptionMuscles from the shoulder girdle help stabilize the joint and control the front-to-back, side-to-side, and rotational movements of the humerus.
Muscles of the shoulder girdle
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  1. A long, cylindrical shaft (body) makes up the image descriptionmiddle part of the humerus. Most of the shaft’s surface is smooth except for the deltoid tuberosity, which is located near the midpoint of the lateral margin. The shaft is an attachment site for several muscles that move the upper arm and lower arm.
Middle part of humerus
Middle part of humerus
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  1. image descriptionDistally, the humerus joins medially with the ulna and laterally with the radius at the elbow joint.
Distal end of the humerus
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  1. The humeroulnar joint is formed by the pulley-shaped trochlea of the humerus and the trochlear notch of the ulna. The humeroradial joint is formed by the rounded capitulum of the humerus and the concave superior surface of the radial head.

Test yourself:

Proximal end: image descriptionShow/Hide answers

Test yourself on the proximal end of humerus
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Middle: image descriptionShow/Hide answers

Middle part of the humerus
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Distal end: image descriptionShow/Hide answers

Distal end of humerus bone
Distal end of humerus bone
Test yourself on the distal end of humerus
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