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Transcript of Anatomy Presentation
large fan-shaped muscle covering upper portion of chest
commonly referred to as a "pec"
more developed in males
origin: clavicle, sternum, cartilage of first 6 ribs
insertion: short tendon into greater tubercle of humerus
action: flexes and adducts arm at shoulder joint; plays a part in deep inhalation; pulls the rib cage to create room for lungs to expand
injuries: during weightlifting and bodybuilding where excessive strain is put on shoulders and chest
medial superficial muscle; the abs; long, flat muscles that extend vertically along the length of the abdomen adjacent to the umbilicus
located inside abdominals and extends from pubis to rib cage
insertion: sternum and costal cartilage of ribs 5-7
action: flexes and rotates vertebral column ; increases abdominal pressure; muscles used when a child is delivered, when coughing, doing crunches, during bowel movements
when muscle is exercised and layers of fat disappear from abdomen, the exposed rectus abdominis muscle creates the look of a 6 pack
most superficial lateral muscle
fibers run down and medially from the crest of the ilium to the pectorals
muscle fibers form letter V
origin: anterior surface of last 8 ribs
insertion: iliac crest
action: flexes and rotates vertebral column; sideways bending and compression of abdomen
-name means broadest back muscle
-many muscular fibers from its many origins merge to a point
-Thin and triangular
-inserts into the intertubercular groove of the humerus and the insertion point
-not used often or strenuously in everyday activities
-very important for: pull-ups, chin-ups, lat pulldowns, and swimming
Deepest level of the abdominal muscles
Located on either side of the torso - ribs to pelvis
underneath the rectus abdominus, internal and external oblique muscles
most important abdominal
used in every limb movement
muscle to exercise "bikini body"
Origin: Costal cartilage of ribs, lumbar fascia, parts of the iliac crest and lateral half of inguinal ligament
Insertion: Aponeurosis and tendon attached to pubic crest and connected to the linea alba
helps with breathing (exhalation, packing organs)
stabilizes the pelvis and lower back/spine
transfer force more efficiently through the muscles instead of back and joints
prevention and reduction of aches and pains (and injuries) caused by related stresses
"Latissimus Dorsi Muscle." Innerbody.com. HOWTOMEDIA, INC, n.d. Web. 2 Dec. 2014.
"Abdominal Muscle Anatomy - The Transversus Abdominis." Abdominal Muscles Anatomy. About Health, n.d. Web. 03 Dec. 2014.
Brumitt, Jason. "Functional Anatomy of the Core: The Abdomen." Excerpts. Human Kinetics, n.d. Web. 03 Dec. 2014.
Healthline Editorial Team. "Internal Oblique." Internal Oblique Origin, Function & Anatomy. Healthline, n.d. Web. 03 Dec. 2014.
Regan, Jennifer M. "The Transverse Abdominis - The Spanx of Your Abdominal Muscles." Bamboo Core Fitness. Bamboo Core Fitness, n.d. Web. 03 Dec. 2014.
"Transversus Abdominis." Master Muscle List. Loyola University Medical Education Network, n.d. Web. 03 Dec. 2014.
"Pectoralis Major Muscle." Wikipedia. Wikipedia Foundation, n.d. Web.
"Medical Information & Trusted Health Advice: Healthline." N.p., n.d. Web.
"Rectus Abdominis." Wikipedia. Wikipedia Foundation, n.d. Web.
"Occupational Therapy 2014 All Flashcards 2012 Fall." Studyblue. N.p., n.d. Web.
the muscles that run along the ribs
help form and move the chest wall
help expand and shrink the size of the chest cavity when you breathe
inhalation (external muscles) and exhalation (internal muscles)- depress the ribs and decrease space in the chest cavity
Innermost intercostal muscle, the deep layers
They originate on ribs 2-12 and have their insertions on ribs 1-11.
Origin: parts of the iliac crest, lumbar fascia
Insertion: costal cartilage from 8th-12th ribs, pubic crest
Insertion: Costal cartilage, aponeurosis, linea alba, and tendons located near the pelvis
help breathing movements
assists with rotation and flexion of abdominal muscles
PECTORALIS MAJOR CONT.
located under the external oblique muscle and on top of the transverses abdominis
external and internal oblique muscles sit at right angles of each other
opposite side rotators - when internal oblique rotates left, the external muscle on the right contracts
antagonist to the diaphragm
wraps around each side of the torso from ribs to spinal chord
Found in the neck, chest and face
covers another neck muscle called the "sternocleidomastoid"
Point of Origin:
the pectoral (chest)
the deltoid (shoulder)
located in the mandible and the skin around the mouth
depresses lower lip
wrinkles skin of neck and upper chest
Antagonistic to temporalis and masseter muscles, which open the jaw
side of neck
covered by platysma muscle
stretches entire length of the neck
from medial portion of collar bone
located in temporal bone's mastoid process
helps with rotation of head
helps with forced inspiration (expansion of ribcage an thorax) when breathing
internal intercostals (compresses thorax)
Rotate your torso from left to right
Lean down to touch your toes
Stand on one leg
Look up and down
Roll your shoulders
Put your left hand over your head and stretch to the right
inhale deeply and exhale deeply
reach up as if you were to grab a bar and squeeze back muscles as you pull down
Origin: lateral third of the clavicle, acromion, spine of scapula of deltoid tubercle.
Insertions: Middle of the lateral surface of the humerus (deltoid tuberosity).
Action: it is responsible for the brunt of all arm rotations.
the deltoid is also tasked with stopping dislocation and injury to the humerus when carrying heavy loads.
the arm must be rotated for the deltoid to have maximum effect.
this ensures that the deltoid is an antagonist muscle of the pectoralis major and the latissimus dorsi during arm adduction.
Location: the deltoid is the muscle forming the rounded contour of the shoulder.
The most common injury with the deltoid is a “deltoid strain”
there is sudden and very sharp pain when injured, there is normally intense soreness and pain when the arm is lifted out from the side of the body.
the deltoid is innervated by the axillary nerve.
the posterior circumflex humeral artery supplies the deltoid.
The trapezius muscle is one of the widest back muscles.
Along with the latissimus dorsi, rhomboids, and the levator scapula.
The semispinalis capitis and trapezius muscles create a muscle column along the back of the neck.
The trapezius is the most superficial of the back, neck, and upper trunk muscles.
Location: lies just beneath the skin and covers the upper back of the shoulders and neck.
This muscle links to the dorsal vertebrae of the spine, scapula, both clavicles, and the ribs.
The trapezius is a postural and active movement muscle, it is used to turn and tilt the head and neck, shrug, steady the shoulders, and twist the arms.
It elevates, depresses, rotates, and retracts the scapula.
The descending part of the trapezius supports the arms.
The transverse part retracts the scapulae and the ascending part rotates or depresses the scapulae.
Origin: medial superior nuchal line and external protuberance of occupied bone, and spinal process.
Insertion: lateral clavicle, acromion and spine of scapula.
Upper fibers: elevate and upwardly rotate the scapula, it also extends the neck.
Middle fibers: retract (adduct) the scapula.
Lower fibers: depress and help upper fibers upwardly rotate scapula.
ex: extend the arms above the head and push chest forward
ex: lay flat on your back, with one leg bent over the other, twist your back in the opposite direction that your legs are facing
ex: press hands together at chest level with elbows widely abducted