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 Minor: smaller   Pectoralis Major Pectoralis Minor

2. Size or Shape of Muscle Maximus: large Longus: Long Brevis: Short   Gluteus Maximus 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 and Back Muscles 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!!!

Deltoid Pectoralis major Serratus Anterior 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 Teres Minor Teres Major BACK MUSCLES – SUPERFICIAL ONLY!!! Teres Minor Teres Major

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

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

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

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

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

Supraspinatus (#6) Infraspinatus (#10) Teres Minor (#11) 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)

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