The document provides an overview of the muscular system, including the three main types of muscle (skeletal, smooth, and cardiac), their characteristics, and comparisons. It describes skeletal muscle in more detail, including its functions, sites of attachment, properties, anatomy, and naming conventions. Examples are given throughout to illustrate muscle actions, locations, shapes, and other naming traits. Key muscles are highlighted for the head/neck, axial skeleton, shoulder, elbow/forearm, hand, hip, thigh, and lower leg.
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Muscular system
1. Muscular System
Muscles are responsible for all types
of body movement
3 basic muscle types are found in the
body
Skeletal
muscle
Cardiac muscle
Smooth muscle
2. Characteristics of Muscles
Muscle cells are elongated
(muscle cell = muscle fiber)
Contraction of muscles is due to the
movement of microfilaments
All muscles share some terminology
Prefix
myo refers to muscle
Prefix mys refers to muscle
Prefix sarco refers to flesh
7. Skeletal Muscle
Functions of Skeletal
Muscle
Produce Movement
Maintain posture
Stabilize joints
Generate Heat
Sites of Muscle
Attachment
Bones
Cartilage
Connective tissue
coverings
Muscle Fibers blend into a
connective tissue
attachment
Tendon—cordlike structure
Aponeurosis—sheet-like
structure
Properties of Muscle
Irritability – ability to receive
and respond to a stimulus
Contractibility – ability to
shorten when an adequate
stimulus is received
Extensibility – ability to
lengthen when an adequate
stimulus is received
Elasticity – ability to return
to normal shape
10. Direction of Muscle Fibers
Relative to the Midline
RECTUS = parallel to the
midline
TRANSVERSE =
perpendicular to midline
Rectus Abdominus
Transverse Abdominus
OBLIQUE = diagonal to
midline
External Oblique
12. Size
Relative Size of Muscle
MAXIMUS = largest
MEDIUS = middle
Fibularis Longus
BREVIS = short
Gluteus Minimus
LONGUS = longest
Gluteus Medius
MINIMUS = smallest
Gluteus Maximus
Fibularis Brevis
TERTIUS = shortest
Fibularis Tertius
13. Number of Origins
Number of tendons of
origin
BICEPS = Two
Biceps
Brachii
Biceps Femoris
TRICEPS = Three
Triceps
Brachii
QUADRICEPS = Four
Quadriceps
Femoris
15. Origin & Insertion
Origin – attachment
to an immoveable
bone
Insertion –
attachment to a
movable bone
ILIO COSTALIS=
attaches to the
ilium & ribs (costal
= ribs)
16. Action
NAME
ACTION
EXAMPLE
FLEXOR
EXTENSOR
Decrease angle at a joint
Flexor Carpi Radialis
Increase angle at a joint
Extensor Carpi Ulnaris
ABDUCTOR
Move bone away from
midline
Abductor Pollicis Longus
ADDUCTOR
LEVATOR
Move bone toward midline
Adductor Longus
Produce upward movement
Levator Scapulae
DEPRESSOR
Produce downward
movement
Depressor Labii Inferioris
SUPINATOR
Turn palm upward/anterior
Supinator
PRONATOR
Turn palm
downward/posterior
Pronator Teres
17. Types of Muscle--Actions
Prime mover (Agonist) – muscle with the
major responsibility for a certain movement
Antagonist – muscle that opposes or
reverses a prime mover
Synergist – muscle that aids a prime mover
in a movement and helps prevent rotation
Fixator – stabilizes the origin of a prime
mover