What is the aponeurosis of the external oblique?
The aponeurosis of the external oblique runs down the center of the abdomen, starting at the bottom of the ribs and ending at the pubis. It’s part of the sheath of the rectus abdominis and runs crosswise to attach the obliques to the other abdominal muscles.
How is the aponeurosis of external oblique arranged?
The aponeurosis of the external oblique was formed of two layers: superficial and deep. The fibres of each layer were perpendicular to those of the other layer. The fibres of the deep layer were the direct continuation of the fleshy bundles of the external oblique muscle and extended downwards and medially.
Where is external oblique located?
The external oblique muscle is one of the outermost abdominal muscles, extending from the lower half of the ribs around and down to the pelvis.
Where does external oblique attach?
External abdominal oblique muscle
|Origin||External surfaces of ribs 5-12|
|Insertion||Linea alba, pubic tubercle, anterior half of iliac crest|
|Action||Bilateral contraction – Trunk flexion, compresses abdominal viscera, expiration Unilateral contraction – Trunk lateral flexion (ipsilateral), trunk rotation (contralateral)|
What is an aponeurosis in anatomy?
aponeurosis, a flat sheet or ribbon of tendonlike material that anchors a muscle or connects it with the part that the muscle moves. The aponeurosis is composed of dense fibrous connective tissue containing fibroblasts (collagen-secreting spindle-shaped cells) and bundles of collagenous fibres in ordered arrays.
What is cranial aponeurosis?
The galea aponeurotica (also called the galeal or epicranial aponeurosis or the aponeurosis epicranialis) is a tough fibrous sheet of connective tissue that extends over the cranium, forming the middle (third) layer of the scalp.
What type of structure is aponeurosis?
What is the function of an aponeurosis?
1. A: aponeuroses are extensions of external tendons on the surface of pennate muscles that function as insertion sites for muscle fascicles and may play a role in modulating fascicle rotation and dynamic gearing during muscle contractions.
Why is it called external oblique?
The external obliques get their name from their position in the abdomen external to the internal abdominal obliques and from the direction of their fibers, which run obliquely (diagonally) across the sides of the abdomen.
What is the origin of external oblique?
Gross anatomy The external oblique muscle arises from the outer surface of the middle of the shaft of the lower six ribs as fleshy fibers. At its origin upper four slips and lower four slips interdigitate with the serratus anterior and the latissimus dorsi muscles respectively.
Where does internal oblique attach?
|Abdominal internal oblique muscle|
|Origin||Inguinal ligament, Iliac crest and the Lumbodorsal fascia.|
|Insertion||Linea alba, Pectineal Line of Pubis (via Conjoint tendon) and ribs 10-12.|
|Nerve||Thoracoabdominal nn. (T7-T11), Subcostal n. (T12), Iliohypogastric n. (L1) and Ilioinguinal n. (L1)|
What do the internal and external obliques do?
Obliques. The external and internal oblique muscles rotate and side bend the trunk. These muscles also contribute to spinal stability.