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Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida Axial Musculature.

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Presentation on theme: "Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida Axial Musculature."— Presentation transcript:

1 Biology 323 Human Anatomy for Biology Majors Lecture 6 Dr. Stuart S. Sumida Axial Musculature

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

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

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

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

8 Intermediate Layer Semispinalis Origin = transverse processes Insertion =spinous processes

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10 Deep Layer Short slips of muscle, connecting adjacent vertebrae

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13 Three Divisions Body Wall Limbs Prevertebral

14 Subdivision of Body Wall Group Abdominal Thoracic Perineal Neck

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

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

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

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20 Subdivision of the Thoracic Group External intercostal Internal Intercostal Transversus thoracis

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24 Subdivision of the Perineal Group Superficial = Urogenital/anal -external anal sphinceter

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

26 Subdivision of the Perineal Group Deep = Transversalis Fascia

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

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34 Strap muscles Rectus Abdominus

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40 Strap muscles Rectus Series Geniohyoid

41 Strap muscles Rectus Series Omohyoid

42 Strap muscles Rectus Series Sternohyoid Sternothyroid

43 Strap muscles Pyramidalis

44 Appendicular Musculature

45 Innervation: Epaxial Hypaxial Dorsal Ramus Ventral Ramus Distal Ventral Branch Distal Dorsal Branch

46 Each limb receives more than 1 nerve: Usually about 6

47 Posterior branches extend more distally

48 Limb Quadrants

49 Dorsal Mass elevates (extends) limb Ventral Mass depresses (flexes) limb

50 Cranial (Superior) Dorsal (Posterior) Caudal (Inferior) Dorsal (Posterior) Cranial (Superior) Ventral (Anterior) Caudal (Inferior) Ventral (Anterior)

51 Cranial (Superior) Dorsal (Posterior) Caudal (Inferior) Dorsal (Posterior) Cranial (Superior) Ventral (Anterior) Caudal (Inferior) Ventral (Anterior)

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53 Cranial/Ventral: (Superior/Anterior) Attaches to pubic bone

54 Caudal/Ventral Inferior/Anterior): Attaches to Ischium

55 Cranial/Dorsal Superior/Posterior): Attaches to upper part of ilium

56 Caudal/Dorsal Inferior/Posterior): Attaches to lower part of ilium

57 Caudal/Dorsal Inferior/Posterior Cranial/Dorsal Superior/Posterior Caudal/Ventral Inferior/Anterior Cranial/Ventral Superior/Anterior

58 Cranial (Superior) Dorsal (Posterior) Caudal (Inferior) Dorsal (Posterior) Cranial (Superior) Ventral (Anterior) Caudal (Inferior) Ventral (Anterior) Caudal view Ventral view Dorsal view Lateral view

59 Cranial (Superior) Dorsal (Posterior) Caudal (Inferior) Dorsal (Posterior) Cranial (Superior) Ventral (Anterior) Caudal (Inferior) Ventral (Anterior) Reptiles= “Sprawling” Posture Mammals = “Non- Sprawling” Posture

60 Lateral view Ventral (Anterior) view

61 The Lumbosacral Plexus


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