Exercises 22 and 23

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Exercises 22 and 23

• Muscles of abdominal wall and pelvic outlet
• Muscles of the hip and lower limb

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Instructions

• Once again you are responsible for the following
  list of muscles.
• Be able to recognize them on models or diagrams
  (or pictures)
• You must know the actions of all of these
• You must know the insertions and origins of those
  highlighted and underlined.

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Ex. 22 Muscles of abdominal wall

• 1. External oblique- compress abdominal contents,
  tense abdominal wall
• 2. Internal oblique- compress abdominal contents,
  tense abdominal wall
• 3.  transverse abdominis- same as above
• 4.  rectus abdominis- same as above and flexes
  vertebral column

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Muscles of pelvic outlet (figure 9.36 in text
table 9.11)

• 1.     Levator ani-supports pelvic viscera,
  provides sphincter action for anal canal and
  vagina
• 2.     superficial transversus perinei-supports
  pelvic viscera
• 3.     bulbospongiosus-in males helps empty the
  urethra in females constricts vaginal opening
• 4.     ischiocavernosus-erects penis or clitoris

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Exercise 23  Muscles of the Hip and Lower Limb.

• http//www.gwc.maricopa.edu/class/bio201/muscle/le
  g1.htm

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Muscles that move the thigh Table 9.12

•   1.  iliopsoas groupflexes thigh (iliacus and
  psoas)
•    2.    gluteus maximus-extends thigh at hip
• 3.gluteus medius-abduct and medially rotate
  femur (help keep balance by shifting weight when
  walking)
• 4.   gluteus minimus-abduct and medially rotate
  femur (help keep balance by shifting weight when
  walking)
• 5.    tensor fascia latae-flexes thigh, abducts
  and medially rotates femur, braces knee when
  opposite foot is lifted 

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Muscles that move thigh continued

• 6.   adductor longus-adducts and laterally rotate
  femur, flex hip joint
• 7. adductor magnus-anterior part adducts and
  laterally rotates femur, posterior part extends
  hip joint
• 8.   gracilis-adducts femur, flexes knee,
  medially rotates tibia
• 9.pectineus (extra muscle to add to
  list)-flexes and adducts thigh

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muscles that move the leg (table 9.13)

•  1. hamstring group (all flex leg)
• -biceps femoris- extends thigh, laterally rotates
  leg
• -semitendinosus-also extends thigh, medially
  rotates tibia
• -semimembranous-also extends thigh, medially
  rotates tibia

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muscles that move the legContinued

• 2.   sartorius-flexes  leg and thigh, rotates and
  abducts femur laterally, used to cross legs
  (tailor muscle)
• 3.     quadriceps femoris group- extend knee
  (straighten your leg)
• -rectus femoris-also flexes hip
• -vastus lateralis
• -vastus medialis
• -vastus intermedius

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muscles that move the foot

• 1. tibialis anterior-dorsiflex and inverts foot
• 2.     peroneus (fibularis) tertius-dorsiflex and
  everts foot
• 3.     extensor digitorum longus-extends toes,
  dorsiflex and evert foot
• 4.     gastrocnemius-flexes leg at knee, plantar
  flex foot
• 5.     soleus-plantar flex foot
• 6.     flexor digitorum longus-flexes toes,
  plantar flex and invert foot
• 7.     peroneus  (fibularis) longus-plantar flex
  and everts the foot 

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Muscles that move foot continued

• 4.     gastrocnemius-flexes leg at knee, plantar
  flex foot
• 5.     soleus-plantar flex foot
• 6.     flexor digitorum longus-flexes toes,
  plantar flex and invert foot
• 7.     peroneus  (fibularis) longus-plantar flex
  and everts the foot

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