Anatomy II: Muscles/Origin/Insertion/Action Flashcards
What is Origin?
Attachment to the bone, does not move bone
What is Insertion?
Attachment to the bone, moves the bone
What is Action?
What it is doing
What is Adduct?
Toward the midline
What is Abduct?
Away from the midline
What is Elevate?
Raising
What is Depress?
Lowering
What is Extend?
Increasing the angle
What is Flex?
Decreasing angle
What is Rotation?
Medial (toward midline) or lateral (away from midline)
Trapezius: Origin, insertion, action
Origin: Occipital bone, cervical, and thoracic vertebrae
Insertion: Scapula, clavicle
Action: Adduct, elevates and raises scapula, raises clavicle,
Deltoid: Origin, Insertion, action
Origin: clavicle, scapula
Insertion: Humerus
Action: Abduct arm
Levator Scapulae: origin, insertion, action
Origin: Clavicle vertebrae
Insertion: Scapula
Action: Raises scapula
Latissimus Dorsi: Origin, Insertion, action
Origin: Sacrum, ilium, lumbar, thoracic vertebrae, ribs
Insertion: Humerus
Action: Elevates, adducts, rotates arm medially; pulls downward; stabilizes scapula
Rhomboideus Major: Origin, insertion, action
Origin: Thoracic vertebrae
Insertion: Scapula
Action: Elevates, adducts scapula and rotates it downward; stabilizes scapula
Rhomboideus Minor: Origin, insertion, action
Origin: Cervical and thoracic vertebrae
Insertion: Scapula
Action: Elevates, adducts scapula and rotates it downward; stabilizes scapula
Infraspinatus: Origin, insertion, action
Origin: Scapula
Insertion: Humerus
Action: Laterally rotates and adducts arm
Supraspinatus: Origin, insertion, action
Origin: Scapula
Insertion: Humerus
Action: Abducts arm
Terres Major: Origin, insertion, action
Origin: Scapula
Insertion: Humerus
Action: Extends, adducts, rotates humerus
Splenius: Origin, insertion, action
Origin: cervical and thoracic vertebrae
Insertion: Temporal and occipital bone
Action: extends and rotates head
Serratus Ventralis (anterior): Origin, insertion, action
Origin: Ribs
Insertion: Scapula
Action: Abducts scapula and rotates it upward
Serratus Ventralis (posterior): Origin, insertion, action
Origin: Vertebrae
Insertion: Ribs
Action: elevates ribs
Spinalis (thoracis): Origin, insertion, action
Origin: thoracic and lumbar vertebrae
Insertion: thoracic vertebrae
Action: extends vertebrae column
Longissimus thoracis: Origin, insertion, action
Origin: sacrum
Insertion: thoracic vertebrae and ribs
Action: Extend and bend vertebral column
Longissimus Cervicis: Origin, insertion, action
Origin: thoracic vertebrae
Insertion: cervical vertebrae
Action: Extends cervical vertebrae
Longissimus Capitis: Origin, insertion, action
Origin: thoracic and cervical vertebrae
Insertion: Temporal bone
Action: Laterally flex and extend head
Iliocostalis: Origin, insertion, action
Origin: ribs
Insertion: C7 vertebrae; lower ribs
Action: extends and bends vertebral column
Multifidus: Origin, insertion, action
Origin: Sacrum, ilium, C, T, L vertebrae
Insertion: vertebrae above origin
Action: Straightens and rotates vertebral column
Pectoralis Major: Origin, insertion, action
Origin: Clavicle, sternum, ribs
Insertion: humerus
Action: Flexes, adducts and rotates shoulder upward
Pectoralis Minor: Origin, insertion, action
Origin: Ribs
Insertion: Scapula
Action: Depresses scapula, rotates shoulder upward
External Oblique: Origin, Insertion, action
Origin: Ribs
Insertion: ilium; linea alba
Action: Compresses abdomen, flexes vertebral column
Internal Oblique: Origin, insertion, action
Origin: ilium
Insertion: lower ribs, linea alba
Action: Compresses abdomen, flexes vertebral column
Transversus Abdominis: Origin, insertion, action
Origin: ilium, ribs
Insertion: Sternum, linea alba, pubis
Action: compresses abdomen, flexes vertebral column
Rectus Abdominis: Origin, insertion, action
Origin: pubis
Insertion: sternum, ribs
Action: compresses abdomen, flexes vertebral column
Sternocleidomastoid: Origin, Insertion, Action
Origin: Sternum, clavicle
Insertion: temporal bone
Action: flex and rotate head
Sternohyoid: Origin, insertion, action
Origin: sternum (manubrium), clavicle
Insertion: hyoid bone
Action: Depresses hyoid bone
Mylohyoid: Origin, insertion, action
Origin: Mandible
Insertion: Hyoid bone
Action: elevates floor of mouth
Digastric: Origin, insertion, action
Origin: mandible
Insertion: hyoid bone
Action: depresses floor of mouth
Masseter: Origin, insertion, action
Origin: zygomatic arch; maxilla
insertion: mandible
Action: elevates and protracts mandible
Temporalis: Origin, insertion, action
Origin: Temporal bone
Insertion: mandible
Action: elevates mandible
Sternothyroid: Origin, insertion, action
Origin: sternum (manubrium)
Insertion: Thyroid cartilage
Action: depresses thyroid cartilage
Thyrohyoid: Origin, insertion, action
Origin: thyroid cartilage
Insertion: hyoid bone
Action: elevates thryoid cartilage, depresses hyoid bone
Cricothyroid: Origin, insertion, action
Origin: cricoid cartilage of larynx
Insertion: thyroid cartilage
Action: produce tension and elongates vocal cords
Geniohyoid: Origin, insertion, action
Origin: Mandible
Insertion: hyoid bone
Action: Draws hyoid bone and tongue anteriorly
