Muscular System Chapter 6. Muscle Types Skeletal muscles – attach to the body’s skeleton Cardiac...
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Transcript of Muscular System Chapter 6. Muscle Types Skeletal muscles – attach to the body’s skeleton Cardiac...
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Muscular System
Chapter 6
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Muscle Types
Skeletal muscles – attach to the body’s skeleton
Cardiac – heart Smooth – walls of hollow organs such as the
stomach, urinary bladder, intestines, and respiratory tract
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Muscle Types (cont.)
Nuclei Striations Intercalated Disks
Voluntary or Involuntary Movement
Cardiac Uninucleated Yes Yes Involuntary
Skeletal Multinucleated Yes No Voluntary
Smooth Uninucleated No No Involuntary
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Tendons and Ligaments
Tendon – attaches muscle to bone Ligament – attaches bone to bone
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Tendons and Ligaments (cont.)
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Muscle Functions
Produces movement Generates heat Maintains posture Stabilizes joints
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Microscopic Anatomy of Skeletal Muscle Myofibrils – long ribbon-like organelles
Have striations A band – dArk color I band – light color
Sarcomere – a segment of a myofibril Myofilaments – threadlike proteins consisting
of actin and myosin Actin – thin filaments Myosin – thick filaments
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Microscopic Anatomy of Skeletal Muscle
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Skeletal Muscle Activity
Electronic impulses originate in the brain Electricity travels through the nervous system Nerves attach to muscle fibers
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Skeletal Muscle Activity
Electricity causes SR to release Ca2+ ions which start myosin heads to bind with actin tails Sarcoplasmic reticulum (SR) – a specialized smooth ER
that store calcium (Ca2+) Example: myosin - fish hooks
actin - chains The end result is muscle contraction
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Skeletal Muscle Activity
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Types of Body Movements
Origin – attached to the immovable or less movable bone
Insertion – attached to the movable bone When the muscle
contracts, the insertion moves toward the origin.
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Types of Body Movements
Flexion – a movement that decreases the angle of the joint and brings two bones closer together
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Types of Body Movements
Extension – a movement that increases the angle, or distance, between two bones or parts of the body
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Types of Body Movements
Adduction – moving a limb toward the body midline
Abduction – moving a limb away (generally on the frontal plane) from the midline
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Types of Body Movements
Rotation – movement of a bone around its longitudinal axis Ex. – Shoulder and head
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Types of Body Movements
Circumduction – a combination of flexion, extension, abduction, and adduction commonly seen in ball-and-socket joints such as the arm The limb as a whole outlines a cone
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Gross Anatomy of Skeletal Muscles Head Muscles
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Facial Muscles
Frontalis – Covers the frontal bone Raises eyebrows and wrinkles forehead
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Orbicularis Oculi Close eyes, squint, blink, and wink
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Orbicularis oris Closes the mouth and protrudes the lips
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Buccinator Flattens the cheek (as in whistling) Aids in chewing
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Zygomaticus “Smiling” muscle
Raises the corners of the mouth upward
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Masseter Closes the jaw
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Facial Muscles
Temporalis Helps closes the jaw
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Gross Anatomy of Skeletal Muscles Trunk and Neck Muscles
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Anterior Muscles
Platysma Pulls the corners of the mouth inferiorly
Orbicularis oris
Temporalis
Orbicularis oculi
Masseter
Frontalis
Zygomaticus
Platysma
Buccinator
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Anterior Muscles
Sternocleidomastoid One head of the muscle
arises from the sternum and the other arises from the clavicle
When both muscles contract, they flex the neck
When one muscle contracts, the head is rotated toward the opposite side
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Anterior Muscles
Pectoralis Major Covers the upper part of the chest Adduct and flex the arm
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Anterior Muscles
Pectoralis Minor Lies deep to the pectoralis major Draws down the scapula or raises the ribs
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Anterior Muscles
Intercostal Muscles Deep muscles found between the ribs Help raise and depress the rib cage for breathing
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Anterior Muscles
Rectus Abdominis The most superficial
muscles of the abdomen Flex the vertebral column Compress the abdominal
contents during defecation and childbirth
Involved with forced breathing
Aponeurosis
Rectus abdominis
External oblique
Internal oblique
Transverse abdominis
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Anterior Muscles
External oblique Make up the lateral walls
of the abdomen Flex the vertebral column Rotate the trunk and
bend it laterally
Aponeurosis
Rectus abdominis
External oblique
Internal oblique
Transverse abdominis
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Anterior Muscles
Internal oblique Deep to the external
obliques Same functions as the
external obliques
Aponeurosis
Rectus abdominis
External oblique
Internal oblique
Transverse abdominis
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Anterior Muscles
Transverse abdominis The deepest muscle of
the abdominal wall Compresses the
abdominal contents
Aponeurosis
Rectus abdominis
External oblique
Internal oblique
Transverse abdominis
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Anterior Muscles
Aponeurosis A sheetlike tendinous
expansion, mainly serving to connect a muscle with the parts it moves
Aponeurosis
Rectus abdominis
External oblique
Internal oblique
Transverse abdominis
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Posterior Muscles
Trapezius Most superficial muscles
of the posterior neck and upper trunk
Extend the head Elevate, depress, and
adduct the scapula
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Posterior Muscles
Latissimus Dorsi The large, flat muscle
pair that covers the lower back
Extends and adducts the humerus
Important when executing a power stroke (swimming) or striking a blow
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Posterior Muscles
Deltoid The main muscles for
arm abduction A favored injection site of
medication less than 5ml (must be given intramuscularly)
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Gross Anatomy of Skeletal Muscles Muscles of the Humerus
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Biceps brachii The main muscle for
flexion of the forearm The best way to
remember its action is that “it turns the corkscrew and pulls the cork”
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Triceps brachii The main muscle for
elbow extension Called the “boxer’s”
muscle because it can deliver a straight-arm knockout punch
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