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A and P Muscles

Covers muscles, their origin, insertions and actions

TermDefinition
Frontalis Origin: Galea Aponeurotica, Insertion: Skin of forehead, Action: Wrinkles forehead and elevates eyebrow
Orbicularis Oris Origin: Mandible and Maxillary, Insertion: Lips, Action: Closes lips/protrude lips for kiss
Temporalis Origin: Temporal Bone, Insertion: Mandible, Action: Chewing
Sternocleidomastoid Origin: Sternum and Clavicle, Insertion: Temporal Bone, Action: Flexes head and neck
Masseter Origin: Zygomatic Arch, Insertion: Mandible, Action: Chewing
Pectoralis Major Origin: Clavicle and Sternum and Costal Cartilage, Insertion: Humerus, Action: Flexes and Adducts and Rotates Humerus medially
Deltoid Origin: Clavicle and Scapula, Insertion: Humerus, Action: Abducts humerus
External Intercostals Origin: Inferior border of upper rib, Insertion: Superior border of lower rib, Action: Breathing (Elevates ribcage)
Latissimus Dorsi Origin: Midline of lower back, Insertion: Humerus, Action: Extends and Adducts and Rotates humerus medially
Trapezius Origin: Midline of neck and back, Insertion: Clavicle and Scapula, Action: Extends head/Elevates and depresses and rotates Scapula: Elevates Clavicle
Supraspinatus Origin: Scapula (posterior border), Insertion: Greater tubercle of humerus, Action: Abduction at the shoulder
Infraspinatus Origin: Scapula (posterior border), Insertion: Greater tubercle of humerus, Action: Lateral rotation at the shoulder,
Teres Minor Origin: Scapula (lateral border), Insertion: Greater tubercle of humerus, Action: Lateral rotation of shoulder
Subscapularis Origin: Scapula (anterior surface), Insertion: Lesser tubercle of humerus, Action: Medial rotation of the shoulder
External abdominal oblique Origin: Lower ribs, Insertion: Linea Alba (band in the middle of the abdomen), Action: Spinal Flexion
Rectus Abdominus Origin: Pubis, Insertion: Sternum, Action: Spinal Flexion
Biceps Brachii Origin: Scapula, Insertion: Radius, Action: Supinates forearm
Brachialis (DEEP) Origin: Anterior humerus, Insertion: Ulna, Action: Flexes elbow
Brachioradialis Origin: Humerus, Insertion: Radius, Action: Flexes elbow
Triceps Brachii Origin: lateral and medial head (humerus)/Long head (scapula), Insertion: Ulna, Action: Extends elbow
Sartorius Origin: Ilium, Insertion: Medial Tibia, Action: Flexes hip and thigh laterally (Crossing legs)
Gracilis Origin: Pubis, Insertion: Medial Tibia, Action: Adducts femur/Flexes KNEE
Adductor Longus Origin: Pubis, Insertion: Femur, Action: Adducts and flexes THIGH
Adductor Magnus Origin: Pubis and Ischium, Insertion: Femur, Action: Adducts and EXTENDS thigh
Rectus Femoris Origin: Ilium, Insertion: Tibia, Action: Extends knee/FLEXES HIP
Vastus Lateralis Origin: Femur, Insertion: Tibia, Action: Extends knee
Vastus Medius Origin: Femur, Insertion: Tibia, Action: Extends knee
Vastus Intermedius Origin: Femur, Insertion: Tibia, Action: Extends knee
Tibialis Anterior Origin: Tibia, Insertion: Tarsals and metatarsals, Action: Dorsiflexion and inverts foot
Gluteus Maximus Origin: Pelvis and Lumbodorsal Fascia, Insertion: Iliotibial Tract, Action: Extends and rotates femur laterally
Gluteus Medius Origin: Ilium, Insertion: Femur, Action: Abducts and medially rotates thigh
Biceps femoris Origin: Long head (ischium)/Short head (Femur), Insertion: Fibula and Tibia, Action: Flexes the knee/Extends the thigh
Semitendinosis Origin: Ischium, Insertion: Medial Tibia, Action: Flexes knee
Semimebranosus Origin: Ischium, Insertion: Tibia, Action: Flexes knee
Gastrocnemius Origin: Femur, Insertion: Achilles tendon to Calcaneous, Action: Plantar flexes and inverts foot/FLEXES KNEE
Soleus Origin: Fibula and Tibia, Insertion: Achilles tendon to Calcaneous, Action: Plantar flexes and inverts foot
Created by: Jhampa
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