lab muscles quiz

origin

less moveable

insertion

more moveable

label A + B

• sartorius

• gracilis

label A + B

• tensor fascia latae

• fascia lata

fascia lata made up of

dense CT

tensor fascia latae function

tightens fascia lata → stabilizes lateral knee

label the quadriceps femoris

1. vastus lateralis

2. rectus intermedius

3. rectus femoris

4. vastus medialis

quadriceps femoris common insertion tendon

quadriceps tendon

where does the quadriceps tendon insert?

patella

quadriceps tendon

prime mover of knee extension

vastus muscles (origin (O), insertion (I), action (A))

O: femur

I: patella + tibial tuberosity

A: extends knee

rectus femoris action

extends knee + flexes hip

label the femoral triangle muscles

1. adductor longus

2. pectineus

3. iliopsoas

femoral triangle muscles function

adductors

adductor femoris

largest of the adductors

adductor femoris + longus (origin (O), insertion (I), action (A))

O: pubic symphsis

I: femur
A: adducts thigh

pectineus action

adducts thigh

label the hamstrings pt 1

• semitendinosus

• semimembranosus

label the hamstrings pt 2

biceps femoris

semimembranosus, semitendinosus (origin (O), insertion (I), action (A))

O: ishial tuberosity

A: flexes knee

biceps femoris (origin (O) + action (A))

O: ischial tuberosity + femur

A: flexes knee

nerve next to hamstrings

sciatic nerve

label a-c

• gluteus medius

• gluteus maximus

• caudofemoralis

gluteus maximus + medius action (A)

A: abducts thigh

label the triceps surae pt 1

• gastrocnemius

• plantaris

• flexor digitorum longus

• tibialis anterior

• calcaneal (achilles) tendon

label the triceps surae pt 2

• gastrocnemius

• fibularis (peroneus)

• extensor digitorum longus

• tibialis anterior

• soleus

triceps surae

• most important group of muscles acting on the ankle

• prime movers of plantar flexion

gastrocnemius

• largest of the 3

• has 2 heads (medial and lateral)

triceps surae common insertion tendon

calcaneal (achilles) tendon

gastrocnemius, solus, plantaris (insertion(I) + action (A))

I: calcaneus via calcaneal tendon

A: plantar flexion

tibialis anterior (action (A)

a: dorsiflexion

tibialis anterior action

dorsiflexion: inversion

flexor digitorum longus

flexes digits (toes)

extensor digitorum longus

extends digits (toes)

label the shoulder + back muscles

• latissimus dorsi

• spinotrapezius

• acromiotrapezius

• clavptrapezius

trapezius

• elevates/depresses the scapula (shrugging shoulders)

• split into 3 muscles in the cat

clavotrapezius insertion (I)

I: clavicle

acromiotrapezius insertion (I)

I: acromion of scapula

spinotrapezius insertion (I)

I: scapular spine

label a-d

• spinodeltoid

• levetator scapulae ventralis

• acromiodeltoid

• clavodeltoid

deltoid

• flexes/extends

• abducts and rotates the arm

• split into 3 muscles in the cat

clavodeltoid origin (O) + insertion (I)

O: clavicle

I: deltoid tuberosity

clavodeltoid (origin (O) + insertion (I))

O: clavicle

I: deltoid tuberosity

acromiodeltoid insertion (I)

deltoid tuberosity

what is the order of the traps + delts?

CAS

rotator cuff

• rotate the humerus (arm)

• stabilize the humerus (shoulder joint)

supraspinatus (origin (O), insertion (I), action (A))

O: supraspinous fossa

I: greater tubercle

A: stabilizes humerus

infraspinatus (origin (O), insertion (I), action (A))

O: infraspinous fossa
I: greater tubercle

A: laterally rotates + stabelizes humerus

subscapularis (origin (O), insertion (I), action (A))

O: subscapular fossa

I: lesser tubercle

A: medially rotates + stabilizes humerus

elevator scapulae ventralis (insertion (I), action (A))

I: scapula

A: elevates scapula

teres major (origin (O) + insertion (I)

O: inferior angle of scapula

I: humerus

label the rhomboid muscles part 1

• rhomboideus capitus

• rhomboideus minor

• rhomboideus major

label the rhomboid muscles part 2

• splenius

• serratus ventralis

• serratus dorsalis

label the errector spinae group

• longissimus dorsi

• iliocostalis

• spinalis dorsi

erector spinae group

largest muscles of the back

label

1. medial bundle

2. upper lateral bundle

3. lower lateral bundle

• multifidus spinae

which 2 muscles do humans not have

caudofemoralis + rhomboideus capitis

Label arm part 1

• long head

• lateral head

• brachialis

label arm part 2 (medial view)

• biceps brachii

• epitrochlearis

Label medial view of forearm

• extensor carpi radialis brevis

• extensor carpi radialis longus

• brachioradialis

• pronator teres

• flexor carpi radialis

• flexor carpi ulnaris

label lateral view of forearm

• extensor carpi radialis longus

• extensor digitorum communis

• anconeus

• extensor digitorum lateralis

biceps brachii (origin (O), insertion (I), action (A))

O: scapula

I: radial tuberosity

A: flexes forearm (elbow)

triceps brachii (origin (O), insertion (I), action (A))

O: scapula + humerus

I: olecranon process of ulna

A: extends forearm (elbow)