Anatomy Block 2 Insertions/origins From Lab 1

Front 1

1. Identify the External Intercostal m.
2. Origin
3. Insertion
4. Innervation
5. Action

Back 1

1. 6
2. Ori: Lower border of rib
3. Ins: Upper border of rib
4. Innerv: Intercostals n.
5. Action: Elevate the ribs during inspiration

Front 2

1. Identify the innermost intercostals
2. Origin
3. Insert
4. Innerv
5. Action

Back 2

1. 15
2. Ori: Lower border of rib
3. Ins: Upper border of rib
4. Innerv: Intercostal nn
5. Act: Elevate the ribs during inspiration

Front 3

1. Identify the internal intercostal mm.
2. Ori
3. Inser
4. Innerv
5. Action

Back 3

1. 12
2. Ori: Ridge on inner surface of inferior aspect of rib and costal cartilage
3. Ins: Fibers that connect with the costal cartilage elevate the ribs; more laterally where the fibers run more obliquely, they depress the ribs and are active during expiration.
4. Innerv: Intercostal nerves
5. Action: Aid in expiration

Front 4

1. Identify the transversus thoracis m
2. Ori
3. Ins
4. Innerv
5. Action

Back 4

1. 5
2. Ori: Posterior surface of lower body of sternum and xiphoid process
3. Ins: Inner surface of costal cartilages 2-6
4. Innerv: Intercostals nn.
5. Action: Depresses ribs

Front 5

1. Identify the external oblique m
2. Ori:
3. Ins:
4. Innerv:
5. Action:

Back 5

1. 9
2. Ori: Lower eight ribs
3. Ins: Iliac crest, rectus sheath, and linea alba
4. Innerv: Intercostals nerves T7-T11 and subcostal nerve T12
5. Action: Compresses abdominal contents, contracting bilaterally it flexes trunk, acting alone it flexes the vertical column laterally and brings the shoulder of the same side forward.

Front 6

1. Identify the internal oblique m in the transverse and coronal plane
2. Ori
3. Ins
4. Innerv
5. Action

Back 6

1. Transverse 23, Coronal 5
2. Ori: Lateral half of inguinal ligament, iliac crest, and thoracolumbar fascia
3. Ins: Inferior borders of the cartilages of the last four ribs, linea alba, pubic crest, and pectineal line.
4. Innerv: Intercostals nerves T7-T11, subcostal nerve T12, and iliohypogastric and ilioinguinal nerves (L1).
5. Action: Compresses abdominal contents, contracting bilaterally it flexes trunk, acting alone it flexes the vertical column laterally and brings the shoulder of the opposite side anteriorly.

Front 7

1. Identify the cremaster m.
2. Ori
3. Ins
4. Innerv
5. Action

Back 7

1. 7
2. Ori: Middle of inquinal ligament and is a continuation of the internal oblique.
3. Ins: Pubic tubercle and crest
4. Innerv: Genital branch of genitofemoral n. (L1-L2)
5. Action: Draws the testes upward.

Front 8

1. Identify the rectus abdominus m.
2. Ori
3. Ins
4. Innerv
5. Action

Back 8

1. 2
2. Ori: Pubis and symphysis
3. Ins: Cartilages of ribs 5-7 and xiphoid process
4. Inn: Intercostals nerves T7-T11 and subcostal n. T12
5. Action: Flexes trunk, tenses anterior abdominal wall, and depresses the ribs