Muscles

Inferior Oblique Muscle of the Eye

Inferior Oblique Muscle of the Eye The structure indicated is the inferior oblique muscle of the eye. This muscle is one of six muscles that are involved in the movements of the eye. The muscles which move the eye are referred to as the extraocular muscles, these include: Superior rectus Inferior rectus Lateral rectus Medial rectus Superior oblique Inferior oblique The oculomotor nerve innervates the superior, inferior and medial rectus muscles as well as the inferior oblique muscle. The trochlear nerve innervates the superior oblique muscle The abducent nerve innervates the lateral rectus muscle. When the inferior oblique muscle is …

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inferior oblique

Extensor Carpi Radialis Longus

Extensor Carpi Radialis Longus The muscle indicated is the extensor carpi radialis longus. The extensor carpi radialis longus muscle is one of 7 muscles located in the superficial compartment of the posterior forearm. The posterior forearm consists of a superficial and a deep compartment. The superficial compartment contains 7 muscles, whereas the deep compartment contains 5 muscles. The superficial compartment of the posterior forearm includes the following 7 muscles: Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Anconeus The muscles of the posterior compartment of the forearm originate from the lateral epicondyle of the humerus and the supraepicondylar ridge and they are all …

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extensor carpi radalis longus

Biceps Brachii – Short Head

Biceps Brachii – Short Head The structure indicated is the short head of the biceps brachii muscle. The biceps muscle is one of three muscles in the anterior compartment of the arm: Biceps brachii Brachialis Coracobrachialis The muscles of the anterior compartment are innervated by the musculocutaneous nerve and generally serve to flex the forearm at the elbow joint. The biceps brachii muscle is comprised of two muscular heads: Short head Long head The short head of the biceps brachii attaches to the coracoid process of the scapula. There are three muscles which attach to the coracoid process: Short head …

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Biceps brachii short head

Gemellus Inferior

Gemellus Inferior The structure indicated is the gemellus inferior muscle. The gemellus inferior muscle is one of the muscles of the gluteal region. The muscles in the gluteal region are divided into a superficial and deep group. There are four muscles of the superficial group: Gluteus maximus Gluteus medius Gluteus minimus Tensor fasciae latae There are 5 muscles in the deep group: Gemellus superior Gemellus inferior Quadratus femoris Piriformis Obturator internus The word gemellus comes from the Latin “gemelli” which means “twins”. There are therefore two gemelli muscles, the gemellus superior, and the gemellus inferior. The gemelli muscles are located …

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gemellus inferior

Flexor Carpi Radialis

Flexor Carpi Radialis The structure indicated is the flexor carpi radialis muscle. The flexor carpi radialis is one of four muscles in the superficial layer of muscles in the anterior compartment of the forearm. The anterior compartment of the forearm consists of three layers of muscles: Superficial layer Intermediate layer Deep layer Four muscles are located in the superficial layer (from lateral to medial): Flexor carpi ulnaris Palmaris longus Flexor carpi radialis Pronator teres All four muscles of the superficial layer have a common origin on the medial epicondyle of the humerus. Origin: Medial epicondyle of humerus Insertion: Bases of …

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flexor carpi radialis

Latissimus Dorsi

Latissimus Dorsi The structure indicated is the latissimus dorsi muscle. The latissimus dorsi muscle is one of the superficial muscles of the back. There are three groups of back mucsles: Superficial Intermediate Deep The superficial group of back muscles consists of 5 muscles: Trapezius Latissimus dorsi Levator scapulae Rhomboid major Rhomboid minor “Latissimus dorsi” translates literally from the Latin has the “broadest muscle of the back”, which reflects its large, flat structure. The latissimus dorsi muscle is involved in several movements of the upper limbs as well as movement at the lumbar spine and it also plays a role as …

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latissimus dorsi

Lateral Pterygoid

Lateral Pterygoid The structure indicated is the lateral pterygoid muscle. The lateral pterygoid muscle is one of four muscles of mastication: Masseter Temporalis Medial pterygoid Lateral pterygoid The muscles of mastication act on the temporomandibular joint (TMJ), which is the joint of the jaw formed between the mandible and temporal bone. The TMJ is a synovial joint, which differs in structure to other synovial joints in that it contains a fibrocartilagenous articular disc that divides the joint into two parts. The two joint compartments result in different movements at the TMJ. The lower joint compartment allows rotational movement, whilst the …

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lateral pterygoid

Flexor Hallucis Brevis

Flexor Hallucis Brevis The structure indicated is the flexor hallucis brevis muscle of the foot. The intrinsic muscles on the plantar aspect of the foot are divided into four layers. The flexor hallucis brevis muscle is located in the third layer of intrinsic foot muscles. There are three muscles located in this layer: Flexor hallucis brevis Adductor hallucis Flexor digiti minimi brevis The flexor hallucis brevis muscle splits into two parts which insert onto the medial and lateral aspects of the base of the first phalanx of the great toe. Origin: Plantar surface of cuboid and lateral cuneiform bone Insertion: Lateral and medial sides of …

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flexor hallucis brevis

Quadratus Lumborum

Quadratus Lumborum The structure indicated is the quadratus lumborum muscle. The quadratus lumborum muscle is one of the muscles which makes up the posterior abdominal wall. There are four muscles which contribute to the posterior abdominal wall: Psoas major Psoas minor Quadratus lumborum Iliacus Origin: Transverse process of L5, iliolumbar ligament, iliac crest. Insertion: Transverse processes of L1-L4, inferior border of 12th rib Action: Depresses and stabilises 12th rib. Weak lateral flexion of trunk Innervation: Anterior rami of T12-L4 Learn more about the muscles of the posterior abdominal wall in this tutorial

quadratus lumborum

Obturator Externus

Obturator Externus The muscle indicated is the obturator externus muscle. The obturator externus is one of six muscles in the medial compartment of the thigh. The thigh consists of three muscular compartments: Anterior Medial Posterior The medial compartments consists of the following muscles: Gracilis Pectineus Adductor longus Adductor brevis Adductor magnus Obturator externus All the muscles of the medial compartment are innervated by the obturator nerve except for the pectineus (femoral nerve) and the hamstring part of the adductor magnus (tibial division of sciatic). The muscles of the medial compartment generally serve to adduct the thigh at the hip joint. …

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Obturator externus