Gross Anatomy of the Muscular System

Facial, Trunk and Back Muscles

When studying the muscle models

• Learn the NAME and LOCATION of the muscle on the model.

• Learn the ACTION of the muscle (what action it produces when the muscle contracts)

A note on muscle actions…

• On the lab exam, you only need to provide ONE action.

• The action MUST have an ACTION word and the BONE/BODY part being acted upon.– Example: Acceptable – FLEX ARM

Unacceptable - FLEX

Facial Expression Muscles

• Epicranius – frontal belly

• Orbicularis oculi

• Orbicularis oris

Facial Expression Muscles

Epicranius - occipital belly

Zygomaticus

Risorius

Origin & Insertion

• Muscles attach at each end to a different bone

• ORIGIN: The bone that DOESN’T move when the muscle contracts

• INSERTION: The bone that DOES move when the muscle contracts

Mastication & Neck Muscles

Masseter

Sternocleidomastoid

Temporalis

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

TORSO MUSCLES – SUPERFICIAL & DEEP!!!

External intercostals

Internal intercostals

TORSO MUSCLES – SUPERFICIAL & DEEP!!!

Deltoid

Pectoralis major

Pectoralis minor

Serratus anterior

TORSO MUSCLES – SUPERFICIAL & DEEP!!!

Rectus abdominis

External oblique

Internal oblique

BACK MUSCLES – SUPERFICIAL ONLY!!!

Deltoid

Trapezius

Latissimus dorsi

BACK MUSCLES – SUPERFICIAL ONLY!!!

Infraspinatus

Teres Minor

Teres Major

BACK MUSCLES – SUPERFICIAL ONLY!!!

Teres Minor

Teres Major

Infraspinatus

BACK MUSCLES – SUPERFICIAL & DEEP!!!

Supraspinatus

Infraspinatus

Teres Minor

Teres Major

BACK MUSCLES – SUPERFICIAL & DEEP!!!

Deltoid

Trapezius

Latissimus dorsi

BACK MUSCLES – SUPERFICIAL & DEEP!!!

Infraspinatus

Teres Minor

Teres Major

BACK MUSCLES – SUPERFICIAL & DEEP!!!

Rhomboid Minor

Rhomboid Major