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Muscles (23)
Locations, Origins, Insertions, and Actions
| Muscle Name | Origin | Insertion | Action |
|---|---|---|---|
| Frontalis | O: Galea aponeurotica | I: Skin near eyebrows | A: Raises eyebrows, pulls scalp anteriorly |
| Occipitalis | O: Occipital bone and temporal bone | I: Galea aponeurotica | A: Pulls scalp posteriorly |
| Temporalis | O: Temporal fossa | I: Coronoid process and ramus of the mandible | A: Closes mandible |
| Zygomaticus | O: Zygomatic bone | I: Angle of mouth | A: Elevates corners of mouth (in a smile or laugh) |
| Scalenus | O: Transverse process of C2-6 | I: Ribs 1 and 2 | A: Flexes and rotates neck, elevates first and second ribs |
| Trapezius | O: Occipital protuberance, ligamentum nuchae, C7-T12 | I: Clavicle, acromion, and spine of scapula | A: Abducts and extends head, rotates and adducts scapula |
| Sternocleidomastoid | O: Sternum and clavicle | I: Mastoid process | A: One - rotates and extends head, both - flexes neck |
| Platysma | O: Fascia over pectoralis major and deltoid muscles | I: Mandible and skin inferior to lower lip | A: Depresses lower lip |
| Brachioradialis | O: Lateral supracondylar ridge of humerus | I: Styloid process of radius | A: Flexes forearm |
| Triceps Brachii | O: Infraglenoid tuberosity of scapula, posterior surface of humerus | I: Olecranon process | A: Adducts arm, extends arm and forearm |
| Deltoid | O: Clavicle, acromion, and spine of scapula | I: Deltoid tuberosity | A: Abducts, flexes, extends medially, and laterally rotates arm |
| Rhomboideus Major | O: T1-T4 | I: Inferior, medial border of scapula | A: Adducts scapula |
| Pectoralis Major | O: Clavicle, sternum, and ribs 1-7 | I: Crest of greater tubercle of humerus | A: Adducts, flexes, and rotates arm medially |
| Serratus Anterior | O: Ribs 1-8 or 9 | I: Vertebral border of scapula | A: Abducts scapula |
| Rectus Abdominis | O: Symphysis pubis and pubic crest | I: Cartilages of ribs 5-7 and xiphoid process | A: Flexes lumbar vertebrae, compresses abdomen |
| Internal Oblique | O: Inguinal ligament, iliac crest | I: Linea alba, inferior 4 ribs | A: Compresses abdomen, laterally rotates trunk |
| Tibialis Anterior | O: Lateral tibia | I: First metatarsal and medial cuneiform | A: Dorsiflexes and inverts foot |
| Biceps Femoris | O: Ischial tuberosity, distal linea aspera of femur | I: Head of fibula, lateral tibia | A: Extends thigh, flexes and laterally rotates leg |
| Semimembranosus | O: Ischial tuberosity | I: Medial tibial condyle | A: Extends thigh, flexes and medially rotates leg |
| Sartorius | O: Anterior superior iliac spine | I: Medial side of tibial tuberosity | A: Flexes and laterally rotates thigh, flexes leg |
| Tensor Fasciae Latae | O: Anterior superior iliac spine | I: Lateral condyle of tibia by the iliotibial band | A: Flexes, medially rotates, and abducts thigh |
| Rectus Femorus | O: Anterior inferior iliac spine | I: Tibial tuberosity | A: Flexes thigh, extends leg |
| Adductor Magnus | O: Ischium and pubis | I: Linea aspera and adductor tubercle of femur | A: Adducts, flexes, extends, ad laterally rotates thigh |
Created by:
albinomaPAche
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