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OINA muscle
Muscle Actions
20
Anatomy
Undergraduate 3
03/06/2013

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Term
Biceps Brachii
Definition
Origin: Supraglenoid tubercle, coracoid process of scapula

Insertion: Radial tuberosity of radius

Innervation: Musculocutaneous

Action: Flexion of forearm
Term
Biceps Femoris
Definition
Origin: Ischial tuberosity, Linea Aspera of femur

Insertion: Head of fibula and lateral condyle of tibia

Innervation: Tibial and fibular nerves

Action: Flexion of leg with thigh extension
Term
Brachioradialis
Definition
Origin: Lateral border of distal end of humerus
Insertion: Superior to styloid process of radius
Innervation: Radial nerve
Action: Flexion of forearm
Term
Deltoid
Definition
Origin: Acromion of scapula, spine of scapula
Insertion: Deltoid tuberosity of humerus
Innervation: Axillary Nerve
Action: Abducts, Flexes, Extends, Medial & Lateral Rotates humerus
Term
External Oblique
Definition
Origin: Ribs 5-12
Insertion: Iliac Crest, Linea Alba
Innervation: Thoracic Spinal Nerves T7-T12; iliohypogastric nerve
Action: Compresses abdomen and flexes spine
Term
Internal Oblique
Definition
Origin: Iliac Crest, Inguinal Ligament, Thoracolumbar fascia
Insertion: Cartilage of ribs 7-10, Linea Alba
Innervation: Thoracic Spinal Nerves (T8-T12), Iliohypogastric nerve, ilioinguinal nerve
Action: Compresses abdomen and flexes spine
Term
Latissimus Dorsi
Definition
Origin: Spinous Processes T7-L5, Lumbar vertebrae, Crests of Sacrum, Ilium
Insertion: Intertubercular sulcus of humerus
Innervation: Thoracodorsal nerve
Action: Extends, Adducts, Medially rotates humerus
Term
Levator Scapulae
Definition
Origin: Transverse processes of C1-C4
Insertion: Superior vertebral border of scapula
Innervation: Dorsal Scapular Nerve and Cervical Spinal Nerves C3-C5
Action: Elevates scapula
Term
Gluteus medius
Definition
Origin: Ilium
Insertion: Greater trochanter of femur
Innervation: Superior gluteal nerve
Action: Abducts & medially rotates femur
Term
Gastrocnemius
Definition
Origin: Lateral & Medial condyles of femur and capsule of knee
Insertion: Calcaneus by way of Achilles tendon
Innervation: Tibial Nerve
Action: Flexes leg; plantar flexes foot
Term
Platysma
Definition
Origin: Fascia over deltoid and pectoralis major muscles
Insertion: Mandible
Innervation: Facial (VII) Nerve
Action: Depression of mandible
Term
Soleus
Definition
Origin: Head of fibula and medial border of tibia
Insertion: Calcaneus by way of Achilles tendon
Innervation: Tibial nerve
Action: Plantar flexes foot
Term
Serratus Anterior
Definition
Origin: Superior eight or nine ribs
Insertion: Vertebral border and inferior angle of scapula
Innervation: Long thoracic nerve
Action: Rotates scapula
Term
Scalenes
Definition
Origin: Transverse process of C3-C6
Insertion: 1st & 2nd Rib
Innervation: Cervical Spine Nerves
Action: Assists in inspiration
Term
Subscapularis
Definition
Origin: Subscapular fossa of scapula
Insertion: Lesser tubercle of humerus
Innervation: Upper and Lower Subscapular nerve
Action: Medially rotates humerus
Term
Tensor Fascia Late
Definition
Origin: Iliac Crest
Insertion: Tibia
Innervation: Superior Gluteal Nerve
Action: Abduction of thigh
Term
Transversus Abdominis
Definition
Origin: Iliac Crest, Inguinal Ligament, Lumbar Fascia
Insertion: Xiphoid Process, Linea Alba, Pubis
Innervation: Thoracic Spinal Nerves (T8-T12), Iliohypogastric nerve, ilioinguinal nerve
Action: Compresses abdomen
Term
Occipitofrontalis
Definition
Origin: Epicranial aponeurosis, Occipital bone, mastoid process of temporal bone
Insertion: Epicranial aponeurosis, skin superior to supraorbital margin
Innervation: Facial (VII) Nerve
Action: Draw scalp anteriorly/posteriorly
Term
Orbicularis Oris
Definition
Origin: Muscle fiber surrounding mouth
Insertion: Skin at corner of the mouth
Innervation: Facial (VII) Nerve
Action: Closes and protrudes the lips for kissing
Term
Sternocleidomastoid
Definition
Origin: Manubrium of sternum, medial third of clavicle
Insertion: Mastoid process of temporal bone, Lateral Half of Superior Nuchal Line of Occipital Bone
Innervation: Accessory (XI) Nerve
Action: Flexes neck
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