How Muscles are NAMED 3 Major Naming Criteria

How Muscles are NAMED 3 Major Naming Criteria

1. Direction of Muscle Fibers • Note a muscle FIBER is a muscle CELL. Skeletal muscle fibers are long and skinny like sticks.

1. Direction of Muscle Fibers • Orbicularis: circular • Rectus: straight • Oblique: slanted

2. Size or Shape of Muscle • Deltoid: triangular • Trapezius: pair of triangles (like a diamond)

2. Size or Shape of Muscle • Major: larger Pectoralis Major Pectoralis Minor • Minor: smaller

2. Size or Shape of Muscle • Maximus: large Gluteus Maximus • Longus: Long • Brevis: Short Fibularis LONGUS Fibularis BREVIS

3. Location of the Muscle • Region of the human body: – Biceps brachii – located in ARM – Biceps femoris – located in THIGH – Rectus abdominis = located in ABDOMEN

3. Location of the Muscle • Anterior vs. Posterior: – Tibialis ANTERIOR – located on FRONT of Tibia – Latissimus DORSI – located on BACK

3. Location of the Muscle • Medial vs. Lateral: – Vastus MEDIALIS: located on INNER side of thigh – Vastus LATERALIS: located on OUTER side of thigh

Facial & Trunk Muscles Facial, Trunk and Back Muscles

Facial Expression Muscles • Epicranius – frontal belly • Orbicularis oculi • Orbicularis oris

Facial Expression Muscles Epicranius - occipital belly Zygomaticus Risorius

Mastication & Neck Muscles Temporalis Masseter Sternocleidomastoid

Torso Muscles – Study on the following 2 models Shows SUPERFICIAL muscles only!!! Shows SUPERFICIAL muscles on RIGHT and DEEP muscle on LEFT!!!

TORSO MUSCLES – SUPERFICIAL ONLY!!! Deltoid Pectoralis major Serratus Anterior

TORSO MUSCLES – SUPERFICIAL ONLY!!! Rectus abdominis External oblique

BACK MUSCLES – SUPERFICIAL ONLY!!! Deltoid Trapezius Latissimus dorsi

Infraspinatus BACK MUSCLES – SUPERFICIAL ONLY!!! Teres Minor Teres Major

TORSO MUSCLES – SUPERFICIAL & DEEP!!! External intercostals (no #)

TORSO MUSCLES – SUPERFICIAL & DEEP!!! Internal intercostals (#26)

TORSO MUSCLES – SUPERFICIAL & DEEP!!! Deltoid (#5) Pectoralis major (#28 and 29) Pectoralis minor (#27) Serratus anterior (#24)

TORSO MUSCLES – SUPERFICIAL & DEEP!!! Rectus abdominis (#78 & 80) External oblique (#77) Internal oblique (#76)

BACK MUSCLES – SUPERFICIAL & DEEP!!! Deltoid (#5) Trapezius (#23) Latissimus dorsi (#13)

BACK MUSCLES – SUPERFICIAL & DEEP!!! Supraspinatus (#6) Infraspinatus (#10) Teres Minor (#11) Teres Major (#12)

BACK MUSCLES – SUPERFICIAL & DEEP!!! Infraspinatus (#10) Teres Minor (#11) Teres Major (#12)

BACK MUSCLES – SUPERFICIAL & DEEP!!! Rhomboid Minor (#20) Rhomboid Major (#18)