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Exam 3 Muscles
Instructor Fabienne Bouton - Exam 3
36
Anatomy
Undergraduate 4
09/28/2012

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Term
Frontal Belly of occipitofrontalis
Definition
Origin: Epicranial aponeurosis
Insertion: Skin of eyebrows
Action: Raises eyebrows and wrinkles forehead
Term
Occipital belly of the occipitofrontalis
Definition
Origin: Superior nuchal line of occipital bone
Insertion: Epicranial aponeurosis
Action: Tenses and retracts scalp
Term
Orbicularis oculi
Definition
Origin: Bony orbit
Insertion: Skin around the palpebrae
Action: Closes eyes
Term
Levator palpebrae superioris
Definition
Origin: Lesser wings of sphenoid
Insertion: Superior palpebrae
Action: Open eyes
Term
Bussinator
Definition
Origin: Alveolar processes (3rd molar teeth) of mandible and maxillae
Insertion: Angle of mouth (orbicularis oris)
Action: compresses cheeks
Term
Orbicularis oris
Definition
Origin: Maxillae and mandible
Insertion: Lips
Action: Closes and purses lips
Term
Depressor anguli oris
Definition
Origin: Body of mandible
Insertion: Angle of mouth
Action: Depresses angle of mouth
Term
Risorius
Definition
Origin: (Fascia associated with) Masseter
Insertion: Angle of mouth
Action: Retracts angle of mouth
Term
Zygomaticus major
Definition
Origin: Zygomatic bone
Insertion: Angle of mouth
Action: Raises angle of mouth
Term
Zygomaticus minor
Definition
Origin: Zygomatic bone
Insertion: Upper lip
Action: Raises upper lip
Term
Platysma
Definition
Origin: Fascia of chest
Insertion: Mandible and skin of sheek
Action: depresses mandible and tenses skin of neck
Term
Masseter
Definition
Origin: Zygomatic arch
Insertion: Angle of the mandible
Action: Elevates manible
Term
Temporalis
Definition
Origin: Temporal fossa
Insertion: Coronoid process of manible
Action: Elevates mandible
Term
Superior rectus
Definition
Origin: Optic canal of sphenoid
Insertion: sclera
Action: Elevates eye
Term
Inferior rectus
Definition
Origin: Optic canal of sphenoid
Insertion: Sclera
Action: Depresses eye
Term
Medial rectus
Definition
Origin: Optic canal of sphenoid
Insertion: Sclera
Action: Moves eye medially
Term
Lateral rectus
Definition
Origin: Optic canal of sphenoid
Insertion: Sclera
Action: Moves eye laterally
Term
Inferior oblique
Definition
Origin: Maxilla (superior aspect)
Insertion: Sclera
Action: Elevates eye and moves eye laterally
Term
Superior oblique
Definition
Origin: Optic canal of sphenoid
Insertion: Sclera
Action: Depresses eye and moves eye laterally
Term
Sternocleidomastoid
Definition
Origin: 2 heads: manubrium of sternum and clavicle
Insertion: Mastoid process of temporal bone
Action: 2 heads together: neck flexion : 1 head rotation
Term
Erector spinae group:
-spinalis group
-longissimus group
-iliocostalis group
Definition
-spinalis group: Medial
-longissimus group: Intermediate
-iliocostalis group: Lateral
Action: Extends, laterally flexes vertebral colum
Term
Intertransversarii
Definition
Origin: Transverse process of inferior vertebra
Insertion: Transverse process of superior vertebra
Action: Laterally flexes vertebral column
Term
Interspinales
Definition
Origin: Spinous process of inferior vertebra
Insertion: Spinous process of superior vertebra
Action: Extends the vertebral column
Term
External intercostals
Definition
Origin: Inferior border of superior rib
Insertion: Superior border of inferior rib
Action: Elevates ribs
Term
Internal intercostals
Definition
Origin: Superior border of inferior rib
Insertion: Inferior border of superior rib
Action: Depresses ribs
Term
Diaphragm
Definition
Origin: *
Insertion: Central tendon
Action: Expands the thoracic cavity for breathing and compresses the abdominopelvic cavity
Term
Rectus abdominis
Definition
Origin: Pubic crest and pubic symphysis
Insertion: Xiphoid process and costal cartilages of ribs 5-7
Action: Compresses abdomen; depresses ribs, and flexes vertebral column
Term
External oblique
Definition
Origin: Ribs 5-12
Insertion: Iliac crest and iliac alba
Action: Compresses abdomen; depresses ribs, flexes and rotates vertebral column
Term
Internal oblique
Definition
Origin: Lumbodorsal fascia, iliac crest, and inquinal ligament
Insertion: Pubic crest, linea alba, ribs 9-12, and costal cartilages of ribs 8-10
Action: Compresses abdomen; flexes and rotates the vertebral column
Term
Transversus abdominis
Definition
Origin: Lumbodorsal fascia, iliac crest, inguinal ligament, ribs 6-12
Insertion: Pubic crest and linea alba
Action: Compresses abdomen
Term
Identify linea alba
Definition
Extends from xiphoid process to the public symphysis
Term
[image]
Definition

A) I band                F) Titin

B) A band              G) M line

C) Myosin               H) H band

D) Actin                  I) Nebulin

E) Z line (or disc)   

 

 

 

 

Term
Organization of skeletal muscle:
Largest to smallest
Definition
Muscle - fascicles - muscle fibers (=cells) - myofibrils - myofilaments : actin and myosin
Term
This connective tissue ensheaths the entire muscle and usually forms the tendon.
Definition
Epimysium : Dense Regular Connective Tissue.
Term
Fascicles composed of numerous 1)_____ and are surrounded by connective tissue called 2)_____
Definition
1)Muscle Fibers (=cells)
2)Perimysium
Term
Fascicles are broken down into 1)_____, which are surrounded by 2)_____.
Definition
1) Muscle Fibers
2) endomysium
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