Anterior Trunk Muscles

Question 1

What are the muscles of the anterior trunk?

Answer 1

• Serratus Anterior
• Pectoralis major
• External oblique
• Internal oblique
• Transversus abdominis
• Rectus abdominis

Question 2

What are the movements of the Serratus Anterior?

Answer 2

Forward arm rotation and pulls scapula forward

Question 3

What are the attachments of the Serratus anterior?

Answer 3

• Origin: from surface of 1st to 8th ribs

- Insertion: along entire length of medial border of scapula

Question 4

What are the movements of pectoralis major?

Answer 4

Humerus flexion and adduction and medial rotation

Question 5

What are the attachments of pectoralis major?

Answer 5

• Origin: clavicular head (medial half of clavicle) and sternal head
• Inserts: lateral lip of intertubercular groove and deltoid tuberosity of humerus

Question 6

What are the movements of external oblique?

Answer 6

Rotates trunk and pulls chest down

Question 7

What are the attachments of external oblique?

Answer 7

• Origin: from ribs 5-12

- Insert: iliac crest and pubic tubercle

Question 8

What are the movements of the internal oblique?

Answer 8

Rotates trunk and supports abdominal wall

Question 9

What are the attachments of internal oblique?

Answer 9

• Origin: inguinal ligament and anterior iliac crest

- Inserts: into linea alba, ribs 10-12 and pectineal line

Question 10

What are the movements of transversus abdominis?

Answer 10

Stabilises vertebral column, trunk movement and tension

Question 11

What are the attachments of the transversus abdominis?

Answer 11

• Origin: pubic symphysis

- Inserts: xiphoid process of sternum, symphysis pubis and linea alba

Question 12

What are the movements of the rectus abdominis?

Answer 12

Rib cage and pelvis tilt inward, toward rib cage

Also spine flexion

Question 13

What are the attachments of rectus abdominis?

Answer 13

• Origin: pubic symphysis

- Inserts: xiphoid process of sternum (and costal cartilages of ribs 5-7)