Gross Human Anatomy Practical 2 (Lab 5 - Abdomen)

Diaphragm Origin

• xiphoid process

• lower costal cartilages

• upper lumbar vertebrae

• medial and lateral arcuate ligaments

Diaphragm Insertion

• central tendon of diaphragm

Diaphragm Action

• expands thorax during inspiration

Diaphragm Nerve

• phrenic nerve

Rectus Abdominus Origin

• pubic symphysis and crest

Rectus Abdominus Insertion

• costal cartilages ribs 5-7

• xiphoid process

Rectus Abdominus Action

• flexes vertebral column

• compresses abdomen

Rectus Abdominus Nerve

• intercostal nerves T7-T12

External Abdominal Oblique Origin

• lower 8 ribs

External Abdominal Oblique Insertion

• abdominal aponeurosis to linea alba

• pubis

• anterior iliac crest

External Abdominal Oblique Action

• flexes vertebral column

• compresses abdomen

• ipsilateral flexion/contralateral rotation of vertebral column

External Abdominal Oblique Nerve

• intercostal nerves T7-T12

• iliohypogastric/ilioinguinal nerves

Internal Abdominal Oblique Origin

• inguinal ligament

• iliac crest

• thoracolumbar aponeurosis

Internal Abdominal Oblique Insertion

• costal cartilages of lower ribs

• abdominal aponeurosis to linea alba

Internal Abdominal Oblique Action

• flexes vertebral column

• compresses abdomen

• ipsilateral flexion/rotation of vertebral column

Internal Abdominal Oblique Nerve

• intercostal nerves T7-T12

• iliohypogastric/ilioinguinal nerves

Transverse Abdominus Origin

• inguinal ligament

• iliac crest

• thoracolumbar aponeurosis

• costal cartilage of ribs 7-12

Transverse Abdominus Insertion

• abdominal aponeurosis to linea alba

• pubis

Transverse Abdominus Action

• compresses abdomen

Transverse Abdominus Nerve

• intercostal nerves T7-T12

• iliohypogastric/ilioinguinal nerves

Quadratus Lumborum Origin

• iliac crest

Quadratus Lumborum Insertion

• 12th rib

• transverse processes L1-L4

Quadratus Lumborum Action

• lateral flexion of vertebral column

• elevates hip

Quadratus Lumborum Nerve

• ventral (anterior) rami T12-L4

Iliacus Origin

• iliac fossa

Iliacus Insertion

• lesser trochanter of femur

Iliacus Action

• flexion of hip

• flexion of lumbar vertebral column

Iliacus Nerve

• femoral nerve

Psoas Major Origin

• T12-L5 vertebral bodies and discs

• L1-L5 transverse processes

Psoas Major Insertion

• lesser trochanter of femur

Psoas Major Action

• flexion of hip

• flexion of lumbar vertebral column

Psoas Major Nerve

• anterior rami - spinal nerve L2-L3

Psoas Minor Origin

• vertebral body of T12-L1

Psoas Minor Insertion

• superior ramus of pubis

Psoas Minor Action

• flexion of lumbar vertebral column

Psoas Minor Nerve

• spinal nerves L1