Two-Jointed Muscles Flashcards

1
Q

What are 2 jointed muscles ?

A
  • also known as biarticular muscles
  • muscles that cross/act on 2 joints rather than just one
  • able to exert force & control movements at both ends
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2
Q

What are 7 examples of two-jointed muscles?

A
  • the hamstrings group (biceps femoris/semimembranosus/semitendinosus)
  • biceps/triceps brachii
  • gastrocnemius
  • Rectus femoris
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3
Q

What is the origin/insertion/innervation/joint crossed/main action of the biceps femoris ?

A
  • O: has 2 heads, long head (Ischial tubersoity), short head (linea aspera)
  • I: head of fibula
  • Inn: sciatic nerve
  • Jt crossed: hip & knee joint
  • MA: hip extension, knee flexion, & lateral rotation of a flexed knee
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4
Q

What is the origin/insertion/innervation/joint crossed/main action of the semimembranosus?

A
  • O: ischial tuberosity
  • I: Posteromedial tibial condyle
  • Inn: sciatic nerve
  • jt crossed: hip & knee joint
  • MA: hip extension, knee flexion, & medial rotation of a flexed knee
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5
Q

What is the origin/insertion/innervation/joint crossed/main action of the semitendinosus?

A
  • O: ischial tuberosity
  • I: medial surface of proximal tibia
  • Inn: sciatic nerve
  • jt crossed: hip & knee joint
  • MA: hip extension, knee flexion, medial rotation of a flexed knee
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6
Q

What is the origin/insertion/innervation/joint crossed/main action of the Rectus femoris?

A
  • O: has 2 heads - straight (AIIS), curved (superior acetabulum)
  • I: tibial tuberosity
  • Inn: femoral nerve
  • jt crossed: hip & knee joint
  • MA: knee extension, hip flexion
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7
Q

What is the origin/insertion/innervation/joint crossed/main action of the gastrocnemius ?

A
  • O: medial/lateral femoral condyles
  • I: posterior calcaneus
  • Inn: tibial nerve
  • jt crossed: knee & ankle joint
  • MA: ankle plantar-flexion or knee flexion
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8
Q

What is the origin/insertion/innervation/joint crossed/main action of the biceps brachii?

A
  • O: has 2 heads - long head (supraglenoid tubercle of scapula), short head (coracoid process of scapula)
  • I: radial tuberosity
  • Inn: Musculocutaneous nerve
  • jt crossed: glenohumeral & elbow joint
  • MA: elbow & shoulder flexion, forearm supination
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9
Q

What is the origin/insertion/innervation/joint crossed/main action of the triceps brachii?

A
  • O: has 3 heads - long head (infraglenoid tubercle of scapula), lateral head (greater tubercle of posterior humerus), medial head (deep, halfway down posterior humerus shaft)
  • I: olecranon process of ulna
  • Inn: radial nerve
  • Jt crossed: shoulder & elbow joint
  • MA: elbow extension & shoulder extension (long head only)
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