Muscular System

1
Muscular System

• Mader
• Study Questions 11-15

2
11. Which muscles of the neck trunk flex
extend the head? (p. 121)

• Table 7.3
• Sternocleidomastoid (named for attachments) on
  either side of the neck flex and head is bent
  towards the chest
• Flex only one sternocleidomastoid and the head
  bends to opposite side
• Trapezius muscles extend the neck

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12. What are the muscles of the abdominal wall?
(p. 122)

• Rectus abdominalis from pubic bones to ribs
  sternum compresses abdominal cavity and flexes
  vertebral column
• External internal obliques transversus
  abdominalis are at a slant and fibers run
  perpendicular to each other between lower ribs
  and pelvic girdle
• All tense and support the abdominal wall

4
13. Name the muscles that move the humerus, and
give their actions. (pp. 123, 125)

• Table 7.4
• Deltoid abducts (moves away from midline) the arm
• Pectoralis major flexes the arm to raise it
  anteriorly, adducts (moves towards midline) the
  arm pulling it across the chest
• Latissimus dorsi (lateral and dorsal) extends and
  adducts the arm
• Terres major extends humerus or adducts
  rotates arm medially

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14. Which of the muscles of the upper limb move
the forearm, what are their actions? Name the
muscles that move the hand fingers. (pp.
125-126)

• Biceps brachii flexes forearm
• Triceps brachii extends forearm
• Brachialis flexex forearm
• Extensor flexor carpi moves wrist hand
• Extensor flexor digitorum moves fingers

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15. Which of the muscles of the lower limb move
the thigh, what are their actions? (pp. 126-29)

• Illiopsoas flexes thigh
• Gluteus maximus extends thigh
• Gluteus medius abducts (moves away from
  midline) thigh
• Adductor group adducts (towards midline) thigh

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15. Which of the muscles of the lower limb move
the lower leg, what are their actions?

• Quadriceps femoris group extends lower leg
• Hamstring group flexes lower leg extends hip
• Sartorius flexes, abducts rotates leg

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15. Which of the muscles of the lower limb move
the feet?

• Gastrocnemius plantar flexion (bending _at_ joint)
  and eversion (sole outward) of foot
• Tibalis anterior dorsiflexion and inversion
  (sole inward) of foot
• Peroneus group - plantar flexion and eversion of
  foot
• Soleus plantar flexes of foot