Pelvis is the region of the trunk that lies below the abdomen. Bony pelvis is the bowl shaped bony structure that forms the skeleton of this region of body. Bony pelvis is formed posteriorly by sacrum and the coccyx and laterally and anteriorly by a pair of hip bones, held together by various ligaments. Study Session 6 Anatomy of the Female Pelvis and Fetal Skull. Introduction. In this study session you will learn about the bony structures with the most.
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In the medial tract, the multifidi originates on the sacrum.
The Pelvic Girdle - Structure - Function - Assessment - TeachMeAnatomy
The superficial group is subdivided into a lateral and a medial group. In the medial superficial group, on both sides of the centre of the abdominal wall the linea albathe rectus abdominis stretches from the bony pelvis of ribs V-VII and the sternum down to the pubic crest.
At the lower end of the rectus abdominis, the pyramidalis tenses bony pelvis linea alba.
The lateral superficial muscles, the transversus and external and internal oblique muscles, originate on the rib cage and on the pelvis iliac crest and inguinal ligament and are attached to the anterior and bony pelvis layers of the sheath of the rectus.
Lateral rotation rotating either the trunk or the pelvis sideways is achieved by contracting the internal oblique on one side and the external bony pelvis on the other. The transversus' main function is to produce abdominal pressure in order to constrict the abdominal cavity and pull the diaphragm upward.
Quadratus lumborum arises from the posterior part of the iliac crest and extends to the rib XII and lumbar vertebrae I-IV.
It unilaterally bends the trunk to the side and bilaterally pulls the 12th rib bony pelvis and assists in expiration. The iliopsoas consists of psoas major and occasionally psoas minor and iliacus bony pelvis, muscles with separate origins but a common insertion on the lesser trochanter of the femur.
Pelvis - Wikipedia
Of these, only iliacus is attached to the pelvis the iliac fossa. However, psoas passes through the pelvis and because it acts on two joints, it is topographically classified bony pelvis a posterior abdominal muscle but functionally as a hip muscle. Iliopsoas flexes and externally rotates the hip joints, while unilateral contraction bends the trunk laterally and bilateral contraction raises the trunk from the supine position.
Anterior view for the top-left and right diagrams.
Posterior view for the bottom-left diagram, Main article: Muscles of the hip The muscles of the hip are divided into a dorsal and a ventral group.
The dorsal hip muscles are either inserted into bony pelvis region of the lesser trochanter anterior or inner group or the greater trochanter posterior or outer group. Anteriorly, the psoas major and occasionally psoas minor originates along the spine between the rib cage and pelvis.
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The iliacus originates on the iliac fossa to join psoas at bony pelvis iliopubic eminence to form the iliopsoas which is inserted into the lesser trochanter. Maximus has a wide origin stretching from the posterior part of the iliac crest and along the sacrum and coccyx, and has two separate insertions: It is primarily an extensor and lateral rotator of the hip joint, but, because of its bipartite insertion, it can both adduct and abduct the hip.
Medius and minimus arise on the external surface of the ilium and are both inserted into the bony pelvis trochanter.
Chapter The bones, joints and walls of the pelvis
Its major functions include transmitting the weight of the body from vertebral column to the lower limbs, and protecting and housing the bony pelvis parts of the gastrointestinal tract, urinary system and reproductive system. Pelvis can be regarded as a basin with holes in its walls. The structure of the basin is composed of four bones which are joined by four joints.