Psoas major muscle

src: c1.staticflickr.com

The psoas major (from spanish: ???? - psÃÆ'³? S: 'from gender', genitive singular form of - the 'loins') is a long fusiform muscle located on the lumbar side of the vertebral column and the lower pelvic edge. It joins the iliac muscles to form iliopsoas.

Video Psoas major muscle

Structure

The psoas major is divided into shallow and deep parts. The inside is derived from the lumbar transverse process of the I-V vertebra. The superficial portion is derived from the lateral surface of the last thoracic vertebra, the lumbar vertebra I-IV, and from the neighbor's intervertebral disk. The lumbar plexus lies between two layers.

The iliacus and psoas major form iliopsoas, which are surrounded by the iliac fascia. The iliopsoas travel across the iliopubic eminence through the muscular lacuna to its insertion on the small trochanter of the femur. The iliopectineal bursa separates the tendon from the iliopsoas muscle from the external surface of the hip joint capsule at the level of iliopubic eminence. The subtendinous iliac bursa lies between the lower trochanter and iliopsoas attachment.

Innervation

The major psoas rank is through the anterior ramie of L1 to L3.

Variations

Less than 50 percent of human subjects, psoas major accompanied by minor psoas.

In animals

In mice, most are fast-moving Type II muscles, while in humans it combines slow, fast fibers.

This muscle is equivalent to tenderloin.

Maps Psoas major muscle

Function

Psoas majors join the upper body and lower body, axial to the appendicular frame, the inside out, and the back to the front. As part of the iliopsoas, major psoas contribute to flexion of the hip joint. In the lumbar spine, unilateral contractions bend the trunk to the lateral, while bilateral contractions lift the stem from the supine position. In addition, attachment to the lower trochanter, lies in the postero-medial aspect of the femur, causing lateral rotation and weak adduction of the hip.

It forms part of a group of muscles called hip flexors, whose actions are primarily to lift the upper leg towards the body when the body is repaired or pull the body toward the leg when the foot is repaired.

For example, when performing a sit-up that brings the torso (including the lower back) away from the ground and toward the front of the foot, the hip flexor (including iliopsoas) will flex the spine in the pelvis.

Because of the frontal attachment of the vertebrae, the rotation of the spine will stretch the psoas.

src: i.ytimg.com

Clinical interests

Psoas can cause seizures or lower back pain by suppressing lumbar discs. Piso hypertonic and inflamed can cause irritation and nerve traps ilioinguinal and iliohypogastric, resulting in sensation of heat or water flowing in the front of the thigh.

Psoas can be palpated with hip active flexion. Psoas positive contractile test and pain with palpation reported by the patient show clinical significance. Treatment should be performed around the abdominal organs, especially the large intestine when palpation is very deep.

The appearance of a prominent abdomen can visually show a hypertonic psoas, which pulls the spine forward while pushing the intestine outward.

src: i.ytimg.com

Ethnic variation

One study using autopsy data found that this muscle is substantially thicker in African-male men than in Caucasian men, and that the occurrence of minor psoas is also an ethnic variant, which is present in most white subjects and is absent in most of the black. subject.

src: upload.wikimedia.org

See also

• Iliopsoas
• Iliacus
• Flexor Hip
• Psoas small muscle
• Iliopsoas tendinitis
• Tenderloin

src: humananatomycharty.com

Note

This article combines text in the public domain of page 467 of the 20th edition of Gray's Anatomy (1918)

src: learnmuscles.com

References

• Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN: 3-13-533305-1.
• Thieme Atlas of Anatomy: General Anatomy and Musculoskeletal System . Thieme. 2006. ISBNÃ, 1-58890-419-9.
• Akuthota, Venu; Ferreiro, Andrea; Moore, Tamara; Fredericson, Michael (2008). "The Principle of Core Stability Exercise" (PDF) . Current Sports Medicine Report . American College of Sports Medicine. 7 (1): 39-44. doi: 10.1097/01.CSMR.0000308663.13278.69. PMID 18296944 . Retrieved March 26 2011 .

src: i.ytimg.com

Additional images

src: anatomyclass01.us

External links

Source of the article : Wikipedia