What is the Trochlea of the humerus?
The medial portion of the articular surface of distal humerus is named the trochlea, and presents a deep depression between two well-marked borders; it is convex from before backward, concave from side to side, and occupies the anterior, lower, and posterior parts of the extremity.
Which bone articulates with trochlea of humerus?
humerus. … smooth articular surfaces (capitulum and trochlea), two depressions (fossae) that form part of the elbow joint, and two projections (epicondyles). The capitulum laterally articulates with the radius; the trochlea, a spool-shaped surface, articulates with the ulna.
Which bones have a trochlea?
The trochlea is the roughly hourglass-shaped feature on the distal end of the humerus. It articulates with the trochlear notch of the ulna.
What is the difference between trochlea and capitulum?
is that capitulum is (botany) a densely clustered inflorescence composed of a large number of individual florets arising from a platform-like base while trochlea is (anatomy) structure resembling a pulley, typically in reference to the area connecting the upper and lower arm.
Is trochlea a bone?
In the human arm, the humeral trochlea is the medial portion of the articular surface of the elbow joint which articulates with the trochlear notch on the ulna in the forearm….
| Trochlea of humerus | |
|---|---|
| FMA | 23370 |
| Anatomical terms of bone |
What is the function of the humerus trochlea?
The trochlea forms the articular surface of the medial column of the elbow and is responsible for allowing ulnohumeral flexion and extension. Fractures of the humeral trochlea can result in elbow stiffness, instability, and post-traumatic arthritis.
Where is the humerus bone located?
upper arm
The humerus is the bone in your upper arm. It’s located between your elbow and your shoulder, and consists of several parts that allow it to move freely in different directions.
What is the end of the humerus called?
The distal end of the humerus has two articular surfaces. The first of these, called the trochlea, is a pulley-shaped surface that accommodates the ulna. The other, called the capitulum, is a small spherical structure lateral to the trochlea that articulates with the head of the radius.
Why is it called the trochlea?
The superior oblique muscle ends in a tendon that passes through a fibrous loop, the trochlea, located anteriorly on the medial aspect of the orbit. Trochlea means “pulley” in Latin; the fourth nerve is named after this structure.
On which surface does the humerus radial nerve run?
The radial nerve arises in the axillary region and descends down along the posterior surface of the humerus. It then passes through the cubital fossa and terminates in the posterior compartment of the forearm, by dividing into two terminal branches: superficial (sensory) and deep (motor).
What muscles attach to greater tubercle of humerus?
Muscle Attachments
| Muscle | Attachment |
|---|---|
| Supraspinatus | Greater Tubercle |
| Infraspinatus | Greater Tubercle |
| Teres Minor | Greater Tubercle Upper Part of the Lateral Border |
| Subscapularis | Lesser Tubercle |