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Muscles

LFS122 Human Anatomy

MuscleACTIONORIGININSERTION
Sternocleidomastoid ACTION: Flexion of neck. Lateral flexion and turning of the head. ORIGIN: Manubrium of sternum; sternal third of clavicle. INSERTION: Mastoid process; lateral half of superior nuchal line.
Diaphragm ACTION: ORIGIN: INSERTION:
External Intercostals ACTION: Elevates rib cage. ORIGIN: Inferior border of the ribs. INSERTION: Superior border of ribs.
Internal Intercostals ACTION: Depresses rib cage. ORIGIN: Superior border of ribs. INSERTION: Inferior border of ribs.
External Abdominal Oblique ACTION: Flexes vertebral column. Compresses abdominal wall. ORIGIN: Ribs 5-12 INSERTION: Linea alba. Pubic crest. Pubic tubercle. Iliac crest.
Internal Abdominal Oblique ACTION: Flexes vertebral column. Compresses abdominal wall. ORIGIN: Lumbar fascia. Iliac crest. Inguinal ligament. INSERTION: Linea alba. Pubic crest.
Transverse Abdominis ACTION: Compresses abdominal contents. ORIGIN: Inguinal ligament. Lumbar fascia. Cartilages of the last 6 ribs. Iliac crest. INSERTION: Linea alba. Pubic crest.
Rectus Abdominis ACTION: Flexes lumbar region of vertebral column. Rotates lumbar region of vertebral column. ORIGIN: Pubic crest. Pubic symphysis. INSERTION: Xiphoid process. Ribs 5-7.
Erector Spinae (Iliocostalis) ACTION: Extend vertebral column, maintain posture. Lateral flexion when acting on one side. ORIGIN: Iliac crests (lumborum). Inferior 6 ribs (thoracis) Ribs 3-6 (cervicis) INSERTION: Angle of ribs (lumborum & thoracis). Cervical vertebrae C6-C4 (cervicis)
Erector Spinae (Longissimus) ACTION: ORIGIN: INSERTION:
Erector Spinae (Spinalis) ACTION: ORIGIN: INSERTION:
Quadratus Lumborum ACTION: Flexes vertebral column laterally when alone. When together, extends lumbar spine and fixes 12th rib. Maintains upright posture. Assists in forced breathing. ORIGIN: Iliac crest and lumbar fascia. INSERTION: Transverse process of upper lumbar vertebrae and lower margin of 12th rib.
Multifidus ACTION: ORIGIN: INSERTION:
Transversus Thoracis ACTION: ORIGIN: INSERTION:
Pectoralis Minor ACTION: ORIGIN: INSERTION:
Pectoralis Major ACTION: ORIGIN: INSERTION:
Serratus Anterior ACTION: Rotates inferior angle of scapula laterally. ORIGIN: Ribs 1-8 INSERTION: Vertebral border of the scapula.
Latissimus Dorsi ACTION: ORIGIN: INSERTION:
Scalenes ACTION: Elevates ribs. Flexion of the neck. ORIGIN: Transverse processes of cervical vertebrae (C1 - C7) INSERTION: Ribs 1-2
Trapezius ACTION: Elevates, depresses, rotates and adducts scapula. ORIGIN: Occipital bone. Spinous processes of C7-T12. INSERTION: Lateral third of the clavicle. Spine of scapula. Acromion process of scapula.
Created by: lhp001