Muscle Anatomy and Function: Head, Neck, Chest, Back, Abdomen, Upper & Lower Limbs

epicranial aponeurosis

Connective tissue structure that connects the frontalis and occipitalis muscles

masseter

O: zygomatic arch/ I: angle & ramus mandible/ A: elev & protract mandible chewing

occipitofrontalis

2 part frontalis (frontal belly)/ occipitals (occipital belly), front occipital bone resp & held by epicranial aponeurosis

orbicularis oculi

Surround rim orbit/ Origin: margin orbit/ Insertion: tiss eyelid/ Action: close eye

orbicularis oris

Origin: maxilla & mandible/ Insertion: soft tiss surround mouth/ Action: lip pursing, scrunch, protrude kiss & whistle musc

platysma

O: fascia over deltoid & pectoralis maj musc/ I: mandible cheek sheet like facial expression/ A: pulls down lip tense neck

buccinator

O: alveolar process maxilla & mandible/ I: orbicularis oris/ A: press cheek to teeth blow, suck whistle

nasalis

O: maxilla/ I: dorsum nose/ A: flare nostrils

frontal belly (frontalis)

Origin: aponeurosis/ Insertion: superior supraorbital margin

occipital belly (occipitalis)

Origin: occipital bone/ Insertion: aponeurosis/ Action: 2 musc alternate pull scalp forward & backward

sternocleidomastoid

SCM 2 head musc deep to ^/ O: manubrium sternum & medial clavicle/ I: mastoid process temporal bone/ A: neck flexion, alone rotate head face opp side & lateral flexion

temporalis

O: temporal bone/ I: coronoid process mandible/ A: elevates mandible

zygomaticus major & minor

Origin: zygomatic bone/ Insertion: MAJOR: angle mouth orbicularis oris & MINOR: upper lip/ Action: lateral musc corners up smile

internal intercostal

Deeper layer forced expiration/ O: superior border rib below/ I: inferior border rib above

external intercostals

Superficial help diaphragm inspiration/ O: inferior border rib above/ I: superior border rib below

latissimus dorsi

O: thoracolumbar fascia 8-12 rib low spine thoracic vertebrae iliac crest/ I: floor intertubercular sulcus humerus/ A: prime agonist arm extension

pectoralis major

O: sternal end clavicle & sternum costal cartilage 2-5/ I: humerus intertubercular sulcus/ A: prime agonist arm flexion should join

serratus anterior

O: ribs 1-8/ I: medial border/ A: protraction scapula against chest wall stabilize boxer muscle

pectoralis minor

O: ribs 3-5/ I: coracoid process scapula/ A: protraction scapula

trapezius

O: occipital bone ligament nuchae spine C7 all thoracic vertebrae/ I: acromion spine scapula lateral 3rd clavicle/ A: ELEVATION: superior fiber up down & RETRACTION: middle fiber blades to midline square & DEPRESSION: inferior fiber pull blades down

diaphragm

Prime agonist musc inspiration/ O: ribs 7-12 xiphoid process lumbar vertebrae/ I: central tendon

external oblique

Rectus abdominis action/ O: rib 5-12/ I: aponeurosis linea alba

rectus abdominis

O: pubic bone/ I: ribs 5-7 xiphoid process sternum/ A: flex vert column compress abdomen (intraabdominal presh)

rectus sheath

Formed by aponeroses, external oblique, internal oblique, transverse abdominis musc, meet@ midline from linea alba extend xiphoid process- pubic symphysis

biceps brachii

Chief forearm flexor/ O: short head coracoid process & long head tubercle above glenoid cavity tendons within joint capsule in intertubercular sulcus/ I: radial tuberosity/ A: elbow flexion, supinates forearm

brachialis

Chief forearm flexor/ O: humerus/ I: coranoid process ulna/ A: prime flexion

brachioradialis

O: lateral border distal end humer/ I: superior styloid process radius/ A: flexes forearm

deltoid

Anterior fiber= flexon pect major & posterior fiber= extensions lat dorsi (arm swing walk, IM injection site)/ O: acromion spine scapula lateral 3rd clavicle/ I: deltoid tuberosity humerus/ A: prime arm abduction

triceps brachii

Prime forearm extension/ O: long head tubercle below glenoid cavity & lateral medial head posterior shaft humerus/ I: olecranon process/ A: prime extension

tensor fasciae latae

O: iliac crest anterior superior iliac spine/ I: tibia via iliotibial tract lateral thick fascia lata/ A: abduction tight hip joint

biceps femoris

Musc posterior thigh cross hip & knee joint, NS sciatic nerve/ O: ischial tuberosity/ I: tibia/ A: prime knee flexion thigh extension

gastrocnemius & soleus

Musc posterior primarily plantar flex food & toes posterior calf, 2 bellies/ O: medial lateral condyles femur/ I: achilles tendon on calcaneus/ A: prime ankle plantar flexion

gluteus maximus

Bulk buttock mass injection site IM, overlies sciatic nerve/ O: dorsal ilium/ I: gluteal tuberosity femur/ A: strong extensor femur

gluteus medius

O: dorsal ilium/ I: greater trochanter femur/ A: abduction medial rotation thigh

rectus femoris

O: anterior inferior iliac spin/ I: quadriceps tendon inserts-patella via patellar ligament-tibial tuberosity/ A: extend knee flex thigh

sartorius

Longest muscle cross hip & knee joint/ O: anterior superior iliac spine/ I: medial aspect proximal tibia/ A: flexes hip laterally rotates thigh cross leg position tailors musc

semimembranosus

Musc posterior thigh cross hip & knee joint, NS sciatic nerve/ O: ischial tuberosity/ I: tibia/ A: prime knee flexion thigh extension

semitendinosus

Musc posterior thigh cross hip & knee joint, NS sciatic nerve/ O: ischial tuberosity/ I: tibia/ A: prime knee flexion thigh extension

tibialis anterior

Musc anterior toe extensors & ankle dorsiflexors/ O: upper tibia/ I: 1st metatarsal medial cuneiform/ A: prime dorsiflexion

vastus lateralis, medialis, intermedius

O: femur/ I: quadriceps tendon inserts-patella via patellar ligament-tibial tuberosity/ A: extend knee

Still learning (6)

You've started learning these terms. Keep it up!