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The human leg is a complex system of muscles, bones, tendons, and ligaments that work together to enable movement, provide stability, and bear the body's weight. One of the key functions of the leg muscles is to facilitate various movements, including rotating the leg inwards. This inward rotation is made possible by several muscles in the thigh and hip region. The adductors, for example, allow the thighs to move towards each other and enable rotation through the hips and legs. The hamstrings, located at the back of the thigh, also play a role in inward rotation by extending the hip and flexing the knee. Additionally, the gluteus medius, located above the gluteus maximus in the hip, helps with pelvis stability and hip abduction, which is the side movement of the leg away from the body. While these muscles contribute to inward rotation, it is important to note that they also serve multiple other functions and work in conjunction with other leg muscles to enable a wide range of movements.
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What You'll Learn
The medial rectus muscle
The medial rectus is the shortest but strongest of the four recti muscles. It is also the largest of the extraocular muscles. The muscle runs superior to the floor of the orbit and inferior to the superior oblique muscle, the ophthalmic artery, and the nasociliary nerve. The medial rectus muscle is supplied with blood from the ophthalmic artery, a branch of the internal carotid artery.
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The superior oblique muscle
The main function of the superior oblique muscle is intorsion, which means it rotates the 12 o'clock point of the vertical meridian of the cornea inward toward the nose. It also moves the line of sight of the eye downward and outward. The superior oblique muscle works in conjunction with other extraocular muscles, such as the medial rectus, to facilitate the movement of the eye.
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The inferior oblique muscle
The primary action of the inferior oblique muscle is to elevate and abduct (move laterally) the eyeball. It also plays a role in extorsion (external rotation) and abduction (moving the eye upward and outward). This muscle is the only one capable of elevating the eye when it is in a fully adducted position. The inferior oblique muscle works in coordination with the other extraocular muscles to control eye movements, positioning the pupil, and adjusting the direction of gaze.
Surgical procedures involving the inferior oblique muscle include loosening (recession), myectomy, marginal myotomy, and denervation and extirpation. It is also relevant in lower lid blepharoplasty surgeries and in the correction of strabismus.
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The oculomotor nerve
The nerve exits the brainstem at the oculomotor sulcus and is enclosed in a prolongation from the arachnoid. It passes through the cavernous sinus and proceeds through the supraorbital fissure to reach the orbit of the eye, where it divides into superior and inferior branches. The superior branch provides motor innervation to the superior rectus and levator palpebrae superioris, while the inferior branch innervates the inferior rectus, medial rectus, and inferior oblique.
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The cranial nerve
The human body has 12 pairs of cranial nerves that control motor and sensory functions of the head and neck. The first two nerves, the olfactory nerve (CN I) and optic nerve (CN II), emerge from the cerebrum, while the remaining ten arise from the brainstem. The olfactory nerve is a sensitive nerve that conveys olfactory stimuli from the nasal cavity to the brain. The olfactory nerve consists of white matter tracts not surrounded by Schwann cells. The optic nerve, on the other hand, emerges from the lateral colliculus, swellings on either side of the temporal lobes of the brain.
The other ten cranial nerves arise from different parts of the brainstem. The oculomotor nerve (III) arises from the midbrain-pontine junction, while the trigeminal nerve (V) comes from the pons. The abducens, facial, and vestibulocochlear nerves (VI-VIII) originate from the pontine-medulla junction. The glossopharyngeal, vagus, and accessory nerves (IX-XI) are found posterior to the olive, while the hypoglossal nerve (XII) is located anterior to it.
Cranial nerves can be described as sensory, motor, or both. They transmit seven types of information, three of which are unique to cranial nerves (SSS, SVS, and SVM). SSS stands for Special Somatic Sensory, which includes senses derived from the ectoderm, such as sight, sound, and balance. SVS, or Special Visceral Sensory, involves senses derived from the endoderm, such as taste and smell. SVM, or Special Visceral Motor, pertains to muscles derived from pharyngeal arches.
The anatomy of cranial nerves is complex, and their knowledge is crucial for detecting pathological alterations in cases of nervous system disorders. Cranial nerve dysfunctions may result from pathological processes within the nerve itself or be associated with tumours, inflammation, infections, or injuries to adjacent structures. Magnetic resonance imaging (MRI) is considered the gold standard technique for studying cranial nerves.
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Frequently asked questions
The adductors are a group of muscles that allow you to bring your thighs toward each other (adduction) and enable rotation through your hips and legs.
The thigh muscles, including the hamstrings, quadriceps, and pectineus, also help with leg rotation.
The hamstrings are a group of muscles that start under your buttocks, run down the back of your leg, and extend to the inside and outside of your knee. They let you flex (bend) your knee, like when you squat, and extend (tilt) your hip to move your leg behind your body.
The quadriceps are a group of four muscles located on the front of the leg that let you flex your hip (for example, squatting or sitting) or extend your knee (standing or reaching your leg in front of you to take a step).
