Lab 4: Axial Muscles

Reflect

When you pull a muscle back to reveal deeper muscles

Origin

The end of a muscle that is fixed during contraction

Insertion

The end of the muscle that undergoes movement during contraction

Innervation

Refers to nerve penetration of muscles

Agonist

Muscle responsible for performing the bulk of the movement

Synergist

The muscle that assists the agonist muscle perform particular movements

Flexion

Reduces the angle of the joint

Adduction

In- Movement towards the longitudinal axis

Pronation

Rotating the forearms so palms face posterior

Extension

Increases the angle of the joint

Abduction

Out- Movement away from the longitudinal axis

Supination

Rotating of forearms so palms face anterior

Frontal Belly of the Occipitofrontalis

Occipital Belly of the Occipitofrontalis

Epicranial Aponeurosis

Temporoparietalis

Corrugator Supercillii

Orbicularis Oculi

Procerus

Nasalis

Zygomaticus Major

Zygomaticus Minor

Orbicularis Oris

Levator Labii Superioris

Depressor Anguli Oris

Depressor Labii Inferioris

Mentalis

Buccinator

Platysma

Temporalis

Masseter

Medial Pterygoid

Lateral Pterygoid

Cut to show the muscle underneath

Anterior Belly of the Digastric

Posterior Belly of the DIgastric

Stylohyoid

Mylohyoid

Sternohyoid

Omohyoid

Sternocleidomastoid

Diaphragm

External Intercostals

Striations going to the exterior

Internal Intercostals

Striations going INwards

Rectus Abdominis

External Obliques

Internal Obliques

Transversus Abdominis

Linea Alba

Tendinous Inscriptions

Pectoralis Major

Pectoralis Minor

Serratus Anterior

Subclavius

Levator Scapulae

Rhomboid Major

Rhomboid Minor

Just the top "line"

Trapezius

Latissimus Dorsi