Muscles

Adductor Brevis

Adductor Brevis The structure indicated is the adductor brevis muscle. The muscle indicated is the adductor brevis muscle of the thigh. The adductor brevis 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 …

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Adductor Brevis

Adductor Longus

Adductor Longus The muscle indicated is the adductor longus muscle of the thigh. The adductor longus 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 …

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adductor longus

Lateral Head of Triceps Brachii

Lateral Head of Triceps Brachii The structure highlighted is the lateral head of the triceps brachii. The triceps brachii is the sole muscle in the posterior compartment of the arm. As the name suggests, the triceps brachii has three heads: Long head Medial head Lateral head These three heads converge to insert on the olecranon of the ulna. The lateral head and long head of the triceps brachii lie superficially, the medial head lies deep to these two heads. The triceps muscle serves to extend the forearm at the elbow joint and is an antagonist of the biceps and brachialis …

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triceps brachii lateral head

Tensor Fasciae Latae Muscle

Tensor Fasciae Latae Muscle The structure indicated is the tensor fasciae latae muscle. The tensor fasciae latae 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 tensor fasciae latae muscle is the most anteriorly situated muscle of the gluteal region and is continuous with the iliotibial tract (iliotibial band), which …

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tensor fasciae latae

Temporalis Muscle

Temporalis Muscle The structure indicated is the temporalis muscle. This muscle is one of the muscles of mastication. The muscles of mastication include: Masseter Temporalis Medial pterygoid Lateral pterygoid The temporalis muscle is a large fan-shaped muscle which lies in the temporal fossa above the zygomatic arch. Origin: temporal line of parietal bone. Temporal surface of sphenoid bone Insertion: coronoid process of mandible and ramus of mandible Innervation: mandibular branch of trigeminal nerve (cranial nerve V) Action: Elevation of the mandible and retraction of the mandible (via posterior horizontal fibres) To learn more about the muscles of mastication, check out …

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temporalis

Palmaris Longus

Palmaris Longus The structure indicated is the palmaris longus muscle of the forearm. The palmaris longus 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: distal half …

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palmaris longus

Biceps Femoris

Biceps Femoris The structure indicated is the biceps femoris muscle of the thigh. The biceps femoris muscle is one of three muscles in the posterior compartment of the thigh. The other muscles are the semimembranosus, and the semitendinosus. The muscles in the posterior compartment are often referred to as the “hamstrings” muscles. Collectively, these muscles are responsible for extending the hip joint, and flexing the knee joint. The biceps femoris lies laterally, and the semitendinosus and semimembranosus lie medially. Just like the biceps muscle in the arm, the biceps brachii , which is Latin for “two headed muscle (biceps) of …

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Biceps Femoris

Soleus Muscle

Soleus Muscle The structure indicated is the soleus muscle of the leg. The soleus is a muscle of the posterior compartment of the leg.The muscles in the posterior compartment of the leg are separated into a superficial group and a deep group. The superficial group consists of the following leg muscles: Gastrocnemius Plantaris Soleus The deep group consists of the following leg muscles: Popliteus Flexor hallucis longus Flexor digitorum longus Tibialis posterior The soleus muscle lies deep to the gastrocnemius and is large and flat in shape running the length of the leg from the knee to the heel, closely …

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Soleus Muscle

Deltoid Muscle

Deltoid Muscle The structure indicated is the deltoid muscle. There are several muscles which act on the glenohumeral joint to produce movement at the shoulder. The deltoid is a large, powerful superficial muscle which is responsible for giving the shoulder its characteristic contour. The deltoid muscle is comprised of three sets of muscle fibres: Anterior fibres Lateral fibres Posterior fibres The various groups of fibres of the deltoid muscle originate on the clavicle and scapula and converge to insert onto the deltoid tuberosity of the humerus. The anterior fibres originate from the anterior border of the lateral third of the …

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Deltoid muscle

Orbicularis Oculi

Orbicularis Oculi The structure indicated is the orbicularis oculi muscle of the face. The orbicularis oculi muscle is one of the muscles of facial expression belonging to the orbital group. The muscles of facial expression can be organised into functional groups to provide a more structured approach to understanding the muscles. The functional groups include the following: Orbital group Nasal group Oral group Other The orbicularis oculi muscle is the principle muscle of the orbital group of facial muscles and consists itself of two parts: Palpebral part Orbital part There is an additional muscle in the orbital group – the …

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Orbicularis Oculi