What action does the infraspinatus muscle perform?
The infraspinatus muscle’s action on the shoulder is primarily through its function as a rotator cuff muscle providing glenohumeral stability. The rotator cuff applies compression upon the head of the humerus that allows for the stabilization of the humeral head during shoulder abduction.
What is the action of the rectus abdominis?
Function. The main action for rectus abdominis is flexion of the trunk (flexion of thoracic and lumber spine), while it works by drawing symphysis and Sternum toward each other. Also, it works on posterior pelvic tilt with other abdominal muscles.
What is the action of the internal oblique muscle?
Function. Along with other abdominal wall muscles, the internal oblique muscle flexes and bends the trunk, assists forced expiration by depressing the lower ribs, and helps to maintain intra-abdominal pressure in defecation, micturition and childbirth.
What’s the action of the supraspinatus?
Action. Contraction of the supraspinatus muscle leads to abduction of the arm at the shoulder joint. It is the main agonist muscle for this movement during the first 15 degrees of its arc.
What is the latissimus dorsi action?
Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate and extend the arm at the glenohumeral joint.
What movement is infraspinatus?
In human anatomy, the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. As one of the four muscles of the rotator cuff, the main function of the infraspinatus is to externally rotate the humerus and stabilize the shoulder joint.
What are the 4 functions of the rectus abdominis?
Rectus abdominis muscle
| Origin | Pubic symphysis, pubic crest |
|---|---|
| Blood supply | Inferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries |
| Function | Trunk flexion, compresses abdominal viscera, expiration |
What is the main action of the rectus abdominis muscle quizlet?
The rectus abdominis flexes the vertebral column in addition to compressing the abdominal wall. The other abdominal muscles compress the abdominal wall and laterally rotate the trunk. What is the action of the serratus anterior muscle?
What are the actions of obliques?
Action. Along with other abdominal wall muscles, the external oblique muscle flexes the trunk, assists expiration by depressing the ribs, and assists to maintain intra-abdominal pressure in evacuation of luminal contents and supports intra-abdominal viscera.
What is the action of the external oblique?
The external oblique functions to pull the chest downwards and compress the abdominal cavity, which increases the intra-abdominal pressure as in a valsalva maneuver. It also performs ipsilateral (same side) side-bending and contralateral (opposite side) rotation.
What movement does the supraspinatus muscle perform?
The supraspinatus muscle assists abduction of the arm and stabilization of the humerus head during arm movements.
What is the function of the tendinous intersection?
Physiological function. The tendinous intersections, in conjunction with the rectus abdominis, function to provide varying degrees of forward flexion to the lumbar region of the vertebral column, producing forward bending at the waist. Forward flexion results in a decreased angle between the trunk and lower body.
What are MRI results of tendon Intersection syndrome?
MRI findings in mild cases are typical of tenosynovitis, including peritendinous fluid and edema around the FHL and FDL at the knot of Henry.26,27 (Cases 23 and 24) More severe cases may demonstrate synovial hypertrophy in the tendon sheath, outpouching of the tendon sheath, tendinosis, partial or complete tendon tears.
Where are the tendinous bands on the rectus abdominis muscle?
Anatomical terminology. The rectus abdominis muscle is crossed by three fibrous bands called the tendinous intersections or tendinous inscriptions. One is usually situated at the level of the umbilicus, one at the extremity of the xiphoid process, and the third about midway between the two.
What is distal intersection tenosynovitis of the wrist?
DISTAL INTERSECTION TENOSYNOVITIS OF THE WRIST. Noninfectious tenosynovitis involving the extensor pollicis longus (EPL), extensor carpi radialis brevis (ECRB) and longus (ECRL) tendons over the wrist is less commonly reported in the literature than the classic forearm intersection syndrome.