Axial Musculature Biology 223 Human Anatomy and Physiology I

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Presentation transcript:

Axial Musculature Biology 223 Human Anatomy and Physiology I Week 5; Lecture 2; Wednesday Dr. Stuart S. Sumida Axial Musculature

Superficial Layer Erector Spinae Spinalis Insertion = spinous Origin = sacrum/iliac crest Spinalis Insertion = spinous processes

Superficial Layer Erector Spinae Longissimus Insertion = transverse Origin = sacrum/iliac crest Longissimus Insertion = transverse processes

Superficial Layer Erector Spinae Insertion = ribs Origin = sacrum/iliac crest Iliocostalis Insertion = ribs

Intermediate Layer Multifidus Insertion = spinous processes Origin = sacrum/iliac crest Insertion = spinous processes

Intermediate Layer Semispinalis processes Insertion =spinous Origin = transverse processes Insertion =spinous Semispinalis has regional designations: Semispinalis capitus (head) Semispinalis cervicis Semispinalis thoracis

Short slips of muscle, connecting adjacent vertebrae Deep Layer Short slips of muscle, connecting adjacent vertebrae

Three Divisions Body Wall Limbs Prevertebral

Subdivision of Body Wall Group Abdominal Thoracic Perineal Neck

Subdivision of the Abdominal Group Superficial = external Oblique Origin: Lower 8 ribs Insertion: top of rectus sheath

Subdivision of the Abdominal Group Intermediate = Internal Oblique Origin: Iliac crest Insertion: Rectus sheath

Subdivision of the Abdominal Group Deep = Transversus Origin: Thoracolumbar fascia Insertion: Sheath below abdominus rectus

Subdivision of the Thoracic Group External intercostal Internal Intercostal Transversus thoracis

Subdivision of the Perineal Group Superficial = Urogenital/anal External sphinceters

Subdivision of the Perineal Group Intermediate = Pelvic Diaphragm: - Coccygeus - Levator ani

Subdivision of the Perineal Group Deep = Transversalis Fascia

Subdivision of the Neck Region Diaphragm ripped out early in development Scalenes are what are left.

Strap muscles Rectus Abdominus

Strap muscles Pyramidalis

Strap muscles Rectus Series Geniohyoid

Strap muscles Rectus Series Omohyoid

Strap muscles Rectus Series Sternohyoid Sternothyroid