Transcript Naming Skeletal Muscles - Mater Academy Charter Middle/ High

Claudio Hernandez
P.3
 Like bones, muscles come in many
shapes and sizes to suit their
particular tasks in the body.
Muscles are distinguished by their
characteristics of their functions
and structure.
 Skeletal muscle moves the skeleton and is responsible
for all our voluntary movements, as well as for the
automatic movements required.
 For example, to stand, to hold up our head, and to
breathe.
 (Other involuntary functions involve smooth muscle
and cardiac muscle.)
 Some muscles are named in reference to some
imaginary line, usually the midline of the body or the
long axis of a limb bone. When a muscle’s name
includes the term rectus (straight), its fibers run
parallel to that imaginary line.
 For example, the rectus femoris is the straight muscle
of the thigh, or femur.
 Similarly, the term oblique as part of a muscle’s name
tells you that the muscle fibers run obliquely (at a
slant) to the imaginary line.
 Such terms as maximus (largest), minimus (smallest),
and longus (long) are often used in the names of muscles.
 For example, the gluteus maximus is the largest muscle of
the gluteus muscle group.
 When the term biceps,
triceps, or quadriceps form
s part of a muscle name,
one can assume that the
muscle has two, three, or
four origins, respectively.
 For example, the biceps
muscle of the arm has two
heads, or origins, and the
triceps muscle has three.
 Occasionally, muscles are
named for their
attachment sites.
 For example, the
sternocleidomastoid
muscle has its origin on
the sternum (sterno) and
clavicle (cleido) and
inserts on
the mastoid process of
the temporal bone.
 Some muscles have a distinctive shape that helps to
identify them. For example, the deltoid muscle is
roughly triangular (deltoid means “triangular”).
Action of the muscle
 When muscles are named for their actions, names like
flexor, extensor, and adductor appear in their names.
 For example, the adductor muscles of the thigh all
bring about its adduction, and the extensor muscles of
the wrist all extend the wrist.
Head and Neck
 Frontalis
 Orbicularis oris
 Orbicularis oculi
 Occipitofrontalis
 Zygomaticus major
 Masseter
 Sternocleidomastoid
 Trapezius
 Buccinator
Muscles of the Trunk
• External Intercostals
• Internal Intercostals
• Transverse
abdominis
• Infraspinatus
• Rectus abdominis
• Serratus anterior
• Diaphragm
Move Upper Extremities

Pectoralis major

Latissimus dorsi

Deltoid

Teres major

Biceps brachii

Triceps brachii

Brachialis

Brachioradialis

Palmaris longus

Flexor carpi radialis.

Flexor digitorum superficialis

Extensor carpi radialis

Extensor digitorum

Extensor digiti minimi

Extensor carpi ulnaris
Move the Lower Extremities
• Iliopsoas
• Sartorius
• Gluteus maximus
• Gluteus medius
• Tensor fasciae latae
• Adductor longus
• Gracilis
• Semimembranosus
• Semitendinosus
• Biceps femoris
• Rectus femoris
• Vastus lateralis
• Vastus intermedium
• Vastus medialis
• Tibialis anterior
• Gastrocnemius
• Soleus
• Peroneus longus
• Peroneus brevis
 Are Skeletal muscles voluntary or involuntary? Why?
 What causes the striations of a skeletal muscle cell?
 What’s your favorite muscle? Why?
 Kopach, Jennifer. 2016 Major Skeletal Muscle List
(n.d.): n. pag. List of 50 Major Skeletal Muscles for
2016. Jennifer Kopach, 1 Jan. 2016. Web. 14 Dec. 2016.
 University, Oxford. "Skeletal Muscle." The Oxford
Companion to the Body. Encyclopedia.com, 1 Jan. 2001.
Web. 14 Dec. 2016.
 Marieb, Elaine N. "Essentials of Human Anatomy &
Physiology, 9th Edition." Essentials of Human
Anatomy & Physiology, 9th Edition. Elaine N Marieb,
24 Aug. 2016. Web. 14 Dec. 2016.