Nervus accessorius

The tutorial covers the accessory nerve, its anatomy, and its role in the nervous system. It explains the difference between efferent and afferent fibers, detailing their functions and pathways. The accessory nerve's anatomy is explored, highlighting its internal and external ramus. Clinical implications of accessory nerve damage are discussed, focusing on muscle weakness and potential lesions.

Which cranial nerve is the accessory nerve classified as?

• 12th cranial nerve

• 11th cranial nerve

• 10th cranial nerve

• 9th cranial nerve

What is the primary function of efferent fibers?

• Transmit sensory information to the brain

• Transmit signals from the brain to muscles

• Connect different parts of the brain

• Regulate blood flow

Which type of efferent fibers are responsible for innervating skeletal muscles?

• Somatic motor efferences

• General visceral afferents

• Viscero motor efferences

• Special somatic afferents

What is the role of afferent fibers in the nervous system?

• Regulate hormone secretion

• Control muscle movements

• Transmit sensory information to the central nervous system

• Transmit signals from the brain to the periphery

Which of the following is NOT a type of afferent fiber?

• General motor efferents

• Special somatic afferents

• Special visceral afferents

• General somatic afferents

Which muscle is innervated by the accessory nerve?

• Biceps brachii

• Trapezius muscle

• Deltoid muscle

• Pectoralis major

What are the two main components of the accessory nerve?

• Dorsal root and ventral root

• Cranial root and spinal root

• Anterior root and posterior root

• Internal ramus and external ramus

What is a common symptom of accessory nerve damage?

• Vision impairment

• Hearing loss

• Loss of taste

• Weakness in the trapezius muscle

Damage to which part of the accessory nerve can lead to paralysis of the sternocleidomastoid muscle?

• Radix cranialis

• External ramus

• Internal ramus

• Radix spinalis

What is the function of the accessory nerve's external ramus?

• Innervates the heart

• Connects to the vagus nerve

• Regulates digestive functions

• Innervates the sternocleidomastoid and trapezius muscles