• Test next class

• Due

• Flashcards (not optional)

• Muscle group worksheets

• Muscle Diagrams (today)

• (or count your test twice)

Pectoralis Minor

• Origin 3rd to 5th ribs • Insertion coracoid

process of scapula• Action Stabilizes

scapula and protracts • Innervation Medial

pectoral nerves;

Pectoralis Major

• Origin• Clavicular head: anterior

surface of medial half of clavicleSternocostal head: anterior surface of sternum, superior six costal cartilages

• Insertion intertubercular groove of humerus

• Action Horizontally Adducts and internally rotates humerus;

Deltoid

• Origin Lateral third of clavicle, acromion, and spine of scapula

• Insertion Deltoid tuberosity of humerus

• Action • Anterior part: flexes

Middle part: abducts armPosterior part: extends

• Innervation Axillary nerve (C5 and C6)

Biceps Brachii

• Origin• Short head: tip of coracoid

process of scapulaLong head: supraglenoid tubercle of scapula

• Insertion Tuberosity of radius and fascia of forearm via bicipital aponeurosis

• Action Supinates forearm and, when it is supine, flexes forearm

• Innervation Musculocutaneous nerve (C5 and C6 )

 Brachialis

• Origin Distal half of anterior surface of humerus

• Insertion Coronoid process and tuberosity of ulna

• Action Major flexor of forearm -- flexes forearm in all positions primarily pronated

• Innervation Musculocutaneous nerve (C5 and C6)

Brachioradialis

• Origin Proximal 2/3 of lateral supracondyle ridge of humerus

• Insertion Lateral surface of distal end of radius

• Action Flexes forearm in a neutral position

• Innervation Radial nerve (C5, C6 and C7)

Trapezius

• Origin base of the occitpital bone & Spine

• Insertion Lateral third of clavicle, acromion, and spine of scapula

• Action superior fibers elevate, middle fibers retract, and inferior fibers depress scapula;

• Innervation Spinal root of accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception)

Rhomboid Major and Minor

• Origin• Minor: spinous

processes of C7 and T1 vertebraeMajor: spinous processes of T2 - T5 vertebrae

• Insertion Medial border of scapula from level of spine to inferior angle

• Action Retract scapula Innervation Dorsal scapular nerve ( C4 and C5)

Latissimus Dorsi

• Origin Spinous processes T7-T12 thoracolumbar fascia, iliac crest

• Insertion intertubercular groove of humerus

• Action adducts, and Internaly rotates humerus;

• Innervation Thoracodorsal nerve

Triceps Brachii

• Origin• Long head: infraglenoid

tubercle of scapulaLateral head: posterior surface of humerus, Medial head: posterior surface of humerus,

• Insertion Olecranon process of ulna

• Action • Chief extensor of elbow • Long Head extends the

Shoulder

Adductor Brevis

• Origin• inferior pubic ramus, • Insertion medial lip of

linea aspera of the Femur

• Action Adducts the thigh,

• Innervation obturator nerve

Gracilis

• Origin pubic symphysis, inferior ramus of pubis,

• Insertion Pes Anserine tendon with sartorious and semitendinosus (Tibia)

• Action adducts the thigh, Flexes the knee,

• Innervation Anterior division of obturator nerve

Pectineus

• Origin Pubic bone• Insertion Pectineal

line of femur• Action Adducts the

thigh and flexes the hip joint

• Innervation Femoral nerve

Adductor Longus

• Origin Pubic Bone• Insertion linea

aspera of the femur,• Action Adducts the

thigh, • Innervation Anterior

division of obturator nerve

Adductor Magnus

• Origin Ishial Tuberosity• Insertion linea aspera,

medial supracondylar ridge, and adductor tubercle

• Action Powerful thigh adductor

• Innervation Posterior division of obturator nerve innervates

Vastus Medialis

• Origin medial lip of linea aspera of femur

• Insertion Medial base of quadriceps tendon

• Action Extends the knee

• Innervation femoral nerve

Vastus Intermedius

• Origin Superior 2/3 of anterior and lateral surfaces of femur

• Insertion Lateral border of patella

• Action Extends the knee

• Innervation femoral nerve

Vastus Lateralis

• Origin greater trochanter, of femur

• Insertion Lateral base and border of patella;

• Action Extends the knee

• Innervation femoral nerve

Rectus Femoris

• Origin anterior inferior iliac spine

• Insertion Base of patella to form the quadriceps femoris tendon

• Action Extends the knee & flexes the hip

• Innervation femoral nerve

Iliopsoas • Origin (2)• Psoas Major L1 - L5 • Iliacus iliac fossa of ilium• Insertion Lesser

trochanter• Action Flex the hip• Innervation Psoas from

direct fibers of L1 - L3 of lumbar plexus; Iliacus femoral nerve

Gluteus Maximus

• Origin Posterior ilium, sacrum and coccyx

• Insertion iliotibial band; also into the gluteal tuberosity of the femur

• Action Major extensor of hip joint

• Innervation Inferior gluteal nerve (L5, S1, S2)

Gluteus Medius

• Origin exterior iliac crest

• Insertion greater trochanter

• Action Major abductor of thigh

• Innervation Superior gluteal nerve (L4, L5, S1)

Gluteus Minimus

• Origin Dorsal ilium• Insertion greater

trochanter• Action Abducts • Innervation Superior

gluteal nerve (L4, L5, S1)

Tensor Fascia Lata

• Origin Anterior superior iliac spine

• Insertion Iliotibial band

• Action Abducts Innervation Superior gluteal nerve (L4, L5, S1)

Extensor Hallucis Longus

• Origin Anterior surface of the fibula Insertion distal phalanx of great toe

• Action Extends great toe and dorsiflexes ankle

• Innervation Deep peroneal nerve (L4, L5, S1)

• Origin Lateral condyle of fibula,

• Insertion middle and distal phalanges 2-5

• Action Extend toes 2 - 5 and dorsiflexes ankle

• Innervation Deep peroneal nerve (L4, L5, S1)

Extensor Digitorum Longus

Tibialis Anterior

• Origin Lateral condyle of tibia,

• Insertion 1st cuneiform and on base of first metatarsal

• Action Dorsiflexor of ankle

• Innervation Deep peroneal nerve (L4, L5, S1)

Peroneus Brevis

• Origin lateral fibular surface;

• Insertion Base of 5th metatarsal base

• Action Everts foot and weak plantar flexor

• Innervation Superficial peroneal nerve

Peroneus Longus

• Origin Head of fibula, • Insertion medial

cuneiform and lateral side of 1st metatarsal base

• Action Everts foot and weak plantar flexor

• Innervation Superficial peroneal nerve

Gastrocnemius

• Origin• Medial head medial

femoral condyle;• Lateral head lateral

femoral condyle• Insertion the Achilles

tendon, inserting on calcaneus

• Action Powerful plantar flexor of ankle

• InnervationTibial nerve (S1, S2)

Soleus

• Origin Posterior fibular head & Tibia, Insertion Achilles tendon, inserting on the calcaneal surface

• Action Powerful plantar flexor of ankle

• Innervation Tibial nerve (S1, S2)

Tibialis Posterior • Origin Posterior aspect

of interosseous membrane, medial fibula,

• Insertion 2• superficial slip navicular

tuberosity• deeper slip plantar

sufraces of metatarsals 2 - 4 and second cuneiform

• Action Principal invertor of foot

• Innervation Tibial nerve (L4, L5)

Flexor Hallucis Longus

• Origin Inferior 2/3 of posterior surface of fibula, lower part of interosseous membrane

• Insertion Plantar surface of base of distal phalanx of great toe

• Action Flexes great toe, inverts the ankle

• Innervation Tibial nerve (S2, S3) (S2, S3)

Flexor Digitorum Longus

• Origin Posterior surface of tibia distal to popliteal line

• Insertion bases of 2nd - 5th distal phalanges

• Action Flexes toes 2 - 5; also helps in plantar flexion of ankle

• Innervation Tibial nerve (S2, S3) (S2, S3)

Semitendinosus

• Origin ischial tuberosity

• Insertion tibia (pes anserine tendon)

• Action Extends the hip and flexes the knee

• Innervation Tibial nerve

Semimembranosus

• Origin ischial tuberosity

• Insertion medial tibial• Action Extends the

hip, flexes the knee• Innervation Tibial

nerve

Biceps Femoris

• Origins (2)• Long head ischial

tuberosity; • short head linea aspera

of femur• Insertion Fibular head• Action Flexes the knee

and the long head also extends the hip joint

• Innervation Long head by tibial nerve; short head by common peroneal nerve

Sartorius

• Origin Anterior superior iliac spine

• Insertion tibia, with Gracillis and Semitendinosus

• Action Flexes and laterally rotates the hip joint and flexes the knee (Hackey Sack)

• Innervation Femoral nerve

Rectus Abdominis

• Origin Pubis Crest • Insertion Ribs (5th,

6th, & 7th) Xipoid Process

• Action Spine (Lumbar) Flexion

Innervation thoraco-abdominal nerves

Internal oblique

• Origin: Inguinal ligament, Iliac crest Insertion: Linea alba, Xiphoid process and the inferior ribs.

• Nerve: lower intercostal nerves

• Action: rotates the torso on the same side

External oblique

• Origin: Lower 8 Ribs• Insertion Iliac crest,

Inguinal Ligament• Nerve: lower 6

intercostal nerve + subcostal nerve

• Action: Rotates torso on the opposite side