The Muscular System Major Movers and Shakers

The Muscular System Major Movers and Shakers

BIOL 2400 – Anatomy and Physiology 1Chapter 11

Temporalis

O: Temporal bone

I: Coronoid process and ramus of the mandible

A: Elevation of the mandible

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Orbicularisoculi

O: Medial wall of the orbit I: Medial wall of the orbit A: Closes the eyelidClick for Answer

Orbicularisoris

O: Opening of the mouth  I: The skin at the cornersof the mouth  A: Closes the mouthClick for Answer

Masseter

O: Maxilla and the anterior portion of thezygomatic arch  I: Angle and the ramus of the mandible.  A: Elevation of the mandible

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Zygomaticusmajor

O: Zygomatic bone  I: The skin at the corners of the mouth and the orbicularis oris  A: Elevates the skin at the corners of the mouth (smiling)

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Depressor angulioris

O: Anterior 1/3 of the body of the mandible, lateral to the mental foramen  I: Angle of the mouth  A: Draws the angle of the mouth laterally and inferiorly, as in opening the mouth

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Supraspinatus

O: The supraspinous fossa of the scapula

I: The greater tubercle of the humerus

A: Weak ABduction of the shoulder joint

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Infraspinatus

O: The infraspinous fossa of the scapula

I: The greater tubercle of the humerus A: Lateral rotation of the humerus

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Teresminor

O: Inferior lateral border of the scapula

I: The greater tubercle of the humerus

A: Lateral rotation of the humerusClick for Answer

Pectoralisminor

O: Ribs 3 through 5 I: The coracoid process of the scapula

A: Protraction of the scapula

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Rhomboidmajor

O: The spinous processes of T2 through T5 I: The vertebral border of the scapula, inferior to the spine A: Retraction of the scapulaClick for Answer

Rhomboidminor

O: The spinous processes of C7 through T1 I: The vertebral border of the scapula, superior to the spine A: Retraction of the scapula

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Levatorscapulae

O: The transverse processesof C1 through C4 I: The superior angle of the scapula A: Elevation of the scapula

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Supinator

O: The lateral epicondyle of the humerus

I: The lateral surface of the proximal third of the radius

A: Supination of the forearmClick for Answer

Pronatorteres

O: The medial epicondyle of the humerus and the coronoid process of the ulna

I: The midlateral surface of the radius

A: Pronation of the forearmClick for Answer

Tricepsbrachii

O: Long head: the inferior margin of the Glenoid fossaLateral head: the lateral, posterior surface of the humerusMedial head: the posterior surface of the humerus I: The olecranon of the ulna A: Extension of the elbow joint

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BrachialisO: The distal, anterior surface of the humerus I: The coronoid process of the ulna A: Flexion of the elbow jointClick for Answer

Bicepsbrachii

O: Long head: superior margin of the Glenoid fossaShort head: the coracoid process of the scapula I: The radial tuberosity of the radius A: Flexion of the elbow joint

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ExternalobliquesO: The last eight (8) ribs I: The iliac crest and the linea alba  A: Both: flexion of the vertebral column Single: lateral flexion of the vertebral column

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Latissimusdorsi

O: Spinous processes of T6 through L5, the iliac crest, the sacrum and ribs 9 through 12

I:The intertubercular groove of the humerus

A: ADduction of the humerus

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Pectoralismajor

O:The clavicle, the sternum and the costal cartilage of ribs 2 through 6

I: The greater tubercle of the humerus

A: ADduction of the humerus

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TrapeziusO: The occipital bone and the spinous processes of C7 through T12

I: The clavicle, the acromion and the spine of the scapula

A: Stabilizes the scapula Superior fibers: elevation of the scapula Intermediate fibers: retraction of the scapula Inferior fibers: depression of the scapula

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Iliopsoas-Iliacus

O: The iliac fossa and the sacrum

I: The lesser trochanter of the femur

A: Flexion of the hip jointClick for Answer

Iliopsoas-Psoas major

O: The transverse processes and bodies of L1 through L5

I: The lesser trochanter of the femur

A: Flexion of the hip joint

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Adductorlongus

O: The pubic crest and the symphysis pubis

I: The linea aspera of the femur

A: ADduction of the hip jointClick for Answer

Fibularis(Peroneus)longus

O: The lateral condyle of the tibia and the head and shaft of the fibula

I: The first metatarsal and the medial cuneiform

A: Plantar flexion of the ankle joint

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Soleus

O: The head of the fibula and the medial shaft of the tibia I: The calcaneus by way of the Achilles tendon A: Plantar flexion of the ankle joint

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Gastrocnemius

O: The medial and lateral condyles of the femur I: The calcaneus by way of the Achilles tendon

A: Plantar flexion of the ankle joint

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Tibialisanterior

O: The lateral condyle and the shaft of the tibia I: The first metatarsal and the medial cuneiform A: Dorsiflexion of the ankle joint

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Quadricepsfemoris

Made of four muscles:1)Rectus femoris2)Vastus lateralis3)Vastus medialis4)Vastus intermedius

Quadricepsfemoris

Rectus FemorisO: The anterior inferior iliac spine (AIIS) I: The tibial tuberosity via the patellar ligament A: Extension of the knee joint Vastus LateralisO: The greater trochanter and the linea aspera of the femur

I: The tibial tuberosity via the patellar ligament

A: Extension of the knee joint

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Quadricepsfemoris

Vastus MedialisO: The linea aspera of the femur

I: The tibial tuberosity via the patellar ligament

A: Extension of the knee joint Vastus IntermediusO: The anterior and lateral surfaces of the shaft of the femur

I: The tibial tuberosity via the patellar ligament

A: Extension of the knee joint

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Sartorius

O: The anterior superior iliac spine (ASIS)

I: The medial surface of the proximal shaft of the tibia

A: ABduction of the hip joint

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GluteusmediusO: The ilium I: The greater trochanter of the femur A: ABduction of the hip joint

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Bicepsfemoris

O: Long head: the ischial tuberosityShort head: the linea aspera of the femur

I: The lateral condyle of the tibia and the head of the fibula

A: Flexion of the knee joint

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Gluteusmaximus

O: The iliac crest, the sacrum and the coccyx I: The gluteal tuberosity of the femur A: Extension of the hip joint

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Anteriordeltoid

O: The clavicle, the acromion and the spine of the scapula I: The deltoid tuberosity

A: ABduction of the shoulder joint Anterior head: flexion of the shoulder joint Lateral head: Abduction of the shoulder joint Posterior head: extension of the shoulder joint

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PosteriordeltoidO: The clavicle, the acromion and the spine of the scapula I: The deltoid tuberosity

A: ABduction of the shoulder joint Anterior head: flexion of the shoulder joint Lateral head: ABduction of the shoulder joint Posterior head: extension of the shoulder joint

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RectusabdominisO: The pubic crest and the symphysis pubis I: Costal cartilage of ribs 5, 6 and 7 A: Flexion of the vertebral columnClick for Answer

Sternocleidomastoid

Sternocleidomastoid

O: The sternum and the clavicle I: The mastoid process of the temporal bone A: Both: flexion of the cervical vertebrae Single: rotation of the head to the opposite side

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Platysma

O: Fascia over the deltoidand pectoralis major muscles  I: Mandible, muscles aroundthe angle of the mouth, and the skin of the lower face  A: Depression of the mandible

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