biology 223 human anatomy and physiology i week 5; lecture 2; wednesday dr. stuart s. sumida axial...
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Biology 223Human Anatomy and Physiology IWeek 5; Lecture 2; WednesdayDr. Stuart S. Sumida
Axial Musculature
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Superficial Layer
Erector Spinae Origin = sacrum/iliac crest
SpinalisInsertion = spinous
processes
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Superficial Layer
Erector Spinae Origin = sacrum/iliac crest
Longissimus Insertion = transverse
processes
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Superficial Layer
Erector Spinae Origin = sacrum/iliac crest
IliocostalisInsertion = ribs
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Intermediate Layer
MultifidusOrigin = sacrum/iliac crestInsertion = spinous processes
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Intermediate Layer
SemispinalisOrigin = transverse
processesInsertion =spinous
processes
Semispinalis has regionaldesignations:•Semispinalis capitus (head)•Semispinalis cervicis•Semispinalis thoracis
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Deep Layer
Short slips of muscle, connecting adjacent vertebrae
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Three Divisions
Body Wall
Limbs
Prevertebral
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Subdivision of Body Wall Group
Abdominal
Thoracic
Perineal
Neck
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Subdivision of the Abdominal GroupSuperficial =
external Oblique
Origin: Lower 8 ribs
Insertion: top of rectus sheath
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Subdivision of the Abdominal GroupIntermediate =
Internal Oblique
Origin: Iliac crest
Insertion: Rectus sheath
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Subdivision of the Abdominal GroupDeep = Transversus
Origin: Thoracolumbar
fascia
Insertion: Sheath below
abdominus rectus
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Subdivision of the Thoracic Group
External intercostal
Internal Intercostal
Transversus thoracis
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Subdivision of the Perineal Group
Superficial = Urogenital/anal
-External sphinceters
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Subdivision of the Perineal Group
Intermediate = Pelvic Diaphragm:
- Coccygeus
- Levator ani
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Subdivision of the Perineal Group
Deep = Transversalis Fascia
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Subdivision of the Neck Region
Diaphragm ripped out early in development
Scalenes are what are left.
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Strap muscles
Rectus Abdominus
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Strap muscles
Pyramidalis
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Strap muscles
Rectus Series
Geniohyoid
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Strap muscles
Rectus SeriesOmohyoid
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Strap muscles
Rectus SeriesSternohyoid
Sternothyroid
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