What does the capitulum of the humerus articulate with?
humerus. … two 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.
What does the Trochlea of the humerus articulate with?
ulna
What fossa is above Trochlea of humerus?
The two depressions—the olecranon fossa, behind and above the trochlea, and the coronoid fossa,…
What is the function of the humerus Trochlea?
During elbow flexion, the vertical anterior part of the trochlea keeps the upper arm and forearm aligned (when viewed in front).
Which is the area of the humerus that is most often fractured?
The most frequently fractured site of the humerus especially in elderly is the surgical neck which is an area of constriction distal to the tuberosities. The deforming forces relevant to PHFs include: pectoralis major: displaces humeral shaft anterior/medial.
How many tubercles are on the humerus?
The humeral upper extremity consists of a rounded head, a narrow neck, and two short processes (tubercles, sometimes called tuberosities). The body is cylindrical in its upper portion, and more prismatic below.
What are the two fossa of the distal humerus?
The distal end of the humerus has two articulation areas, which join the ulna and radius bones of the forearm to form the elbow joint. Similarly, the posterior humerus has the olecranon fossa, a larger depression that receives the olecranon process of the ulna when the forearm is fully extended.
Is the radius distal to the humerus?
Humerus: The humerus attaches proximally to the scapula (shoulderblade) at the humeral head and distally with the radius and ulna (lower-arm bones) at the trochlea and capitulum, respectively. The proximal portion of the humerus can be divided into three parts.
Which fossa are found on the anterior side of the humerus?
Coronoid Fossa
What is the difference between the anatomical and surgical neck of the humerus?
The anatomical neck of the humerus is located distal to the head of the humerus, at an oblique angle to the shaft of the humerus. The surgical neck of the humerus on the other hand is a constriction of the humerus located inferior to the greater and lesser tubercles.
Which neck of the humerus is more likely to fracture?
4-9). As noted earlier, the surgical neck is the most frequent site of a humerus fracture in adults. Surgical neck fractures can result in abduction of the proximal fragment by the rotator cuff. Fractures between the pectoralis major and deltoid insertions result in adduction of the proximal fragment by the pectoralis.
Which of the following nerves is involved in fracture neck humerus?
A fracture in this area is most likely to cause damage to the axillary nerve and posterior circumflex humeral artery.
Why it is called surgical neck of humerus?
The surgical neck of the humerus is the most common fracture site on the proximal humerus. But here’s the kicker. It’s a misnomer! Just because you see a fracture of the surgical neck of the humerus doesn’t meed it needs surgery!
What is a 3 part fracture of surgical neck of humerus?
3-PART FRACTURE: This is when the proximal humerus is broken into three pieces, and there are then two fracture lines on x-ray. This most often involves the greater tuberosity and the surgical neck of the humerus.
What muscles are attached to the humerus?
The pectoralis major, latissimus dorsi, deltoid, and rotator cuff muscles connect to the humerus and move the arm. The muscles that move the forearm are located along the humerus, which include the triceps brachii, biceps brachii, brachialis, and brachioradialis.
What is the significance of anatomical neck of humerus?
It represents the fused epiphyseal plate. It is best marked in the lower half of its circumference; in the upper half it is represented by a narrow groove separating the head of the humerus from the two tubercles, the greater tubercle and the lesser tubercle….
| Anatomical neck of humerus | |
|---|---|
| FMA | 23356 |
| Anatomical terms of bone | |
Which of the following is a proximal feature of the humerus?
Firstly, the most proximal feature of the humerus is the head of the humerus (which in bone development is defined as ephy This feature articulates with the glenoid cavity of the scapula which allows various movements and actions as previously mentioned in the paragraph above.
Which structure is most likely to be damaged with a displaced fracture of the anatomical neck of the humerus?
The radial nerve is most likely to be damaged in humerus fractures that have a lateral displacement of the distal fracture segment, as the nerve is tethered to the bone and cannot withstand the forces applied to it as a result of the displacement.
What are the signs and symptoms of a humerus fracture?
What are the symptoms of a humerus fracture?
- Pain.
- Swelling and bruising.
- Inability to move the shoulder.
- A grinding sensation when the shoulder is moved.
- Deformity — “It does not look right.”
- Occasionally bleeding (open fracture)
- Loss of normal use of the arm if a nerve injury occurs.
How painful is a fractured humerus?
Humerus fractures are a very painful injury, and patients may need to take pain relief medications regularly as prescribed by the doctor. The fractured portion may hurt intensely, swell, and feel stiff. Stiffness may continue well after the fracture has healed.
How do you stabilize a broken humerus?
In many cases, proximal and mid-shaft humerus fractures don’t require surgery because the broken ends usually stay close together. This makes it easier for your humerus to heal on its own. However, you’ll still need to wear a sling, brace, or splint to keep your arm from moving and stabilize your shoulder, if needed.
How long does it take for a broken humerus to heal?
In adults of almost any age, proximal humerus fractures take four to eight weeks to heal well enough that they do not need any external support. Good strength is achieved by 12 weeks, but full healing with remodeling of the underlying bone may take 6 to 12 months.
How do you sleep with a broken humerus?
You should sleep upright, either in an arm chair, or sitting up in bed propped up on plenty of pillows. Your upper arm should be allowed to hang and not be rested on pillows which may force your shoulder upwards.
How do I shower with a broken humerus?
NO BATHING OR SHOWERING. To wash under the injured arm, lean slightly to the side and forward. This will give access to the underarm. Use a face cloth, soap and water ensuring the area is dried thoroughly. Do not try to raise your arm A fractured Humerus can be very mobile.