Human Muscles Lab Pt 1

Occipitofrontalis Frontal Belly

Occipitofrontalis Occipital Belly

Temporalis

Orbicularis Oculi

Zygomaticus Major

Elevates corner of mouth

Zygomaticus Major Action

Obicularis Oris

Purses lips

Obicularis Oris Action

Masseter

Elevates the jaw

Masseter Action

Superior Rectus

Superior Rectus

Elevates and medially rotates the eye

Superior Rectus Action

Inferior Rectus

Inferior Rectus

Depresses medially

Inferior Rectus Action

Medial Rectus

Moves eye medially

Medial Rectus Action

Lateral Rectus

Moves eye laterally

Lateral Rectus Action

Superior Oblique

Superior Oblique

Depresses and laterally rotates eye

Superior Oblique Action

Inferior Oblique

Inferior Oblique

Elevates and laterally rotates eye

Inferior Oblique Action

Digastric

Mylohyoid

Mylohyoid

Sternohyoid

Sternothyroid

Thyrohyoid

Sternocleidomastoid

Flexes neck

Sternocleidomastoid Action

Sternocleidomastoid Lateral Head

Sternocleidomastoid Medial Head

Pectoralis Major

Sternal end of clavicle, sternum, and cartilage of ribs 1-6

Pectoralis Major Origin

Greater tubercle of humerus

Pectoralis Major Insertion

Flexes arm

Pectoralis Major Action

Pectoralis Minor

Ribs 3-5

Pectoralis Minor Origin

Coracoid process of scapula

Pectoralis Minor Insertion

Protracts and rotates scapula inferiorly

Pectoralis Minor Action

Serratus Anterior

External Intercostal

Green

Elevates ribs

External Intercostal Action

Internal Intercostals

Yellow

Depresses ribs

Internal Intercostals Action

Rectus Abdominis

Pubic crest and symphysis

Rectus Abdominis Origin

Xiphoid process and costal cartilages of ribs 5-7

Rectus Abdominis Insertion

Flexes vertebral column

Rectus Abdominis Action

External Oblique

Internal Oblique

Transversus Abdominis

Transversus Abdominis Linea Alba

Transversus Abdominis Diaphragm

Trapezius

Occipital bone, spines of C7 and thoracic vertebrae

Trapezius Origin

Acromion and spine of scapula, lateral clavicle

Trapezius Insertion

Latissimus Dorsi

Lower six thoracic vertebrae

Latissimus Dorsi Origin

Intertubercular sulcus of humerus

Latissimus Dorsi Insertion

Extends arm

Latissimus Dorsi Action

Levator Scapulae

Rhomboid Minor

Rhomboid Major

Teres Major

Teres Major

Erector Spinae Group

Extends vertebral column

Erector Spinae Group Action

Spinalis

Spinalis

Blue

Longissimus

Longissimus

Yellow

Iliocostalis

Iliocostalis

Red

Subscapularis

Infraspinatus

Infraspinous fossa of scapula

Infraspinatus Origin

Greater tubercle of humerus

Infraspinatus Insertion

Abducts arm

Infraspinatus Action

Teres Minor

Teres Minor

Lateral third of clavicle, acromion and scapular spine

Teres Minor Origin

Deltoid tuberosity of humerus

Teres Minor Insertion

Laterally rotates arm - synergist to infraspinatus

Teres Minor Action

Neuromuscular junction

Sarcolemma

Sarcoplasm

Nucleus

Nucleus

Schwann Cell

Myelin Sheath

Endomysium

Myofibril

Axon Terminal

Motor End Plate