Ciliospinal reflex

Ciliospinal reflex is a neurological response in the human body that involves the pupil of the eye dilating in response to pain or touch in the neck, face, or upper trunk. This reflex is used in clinical settings to assess the function of the sympathetic nervous system.

Mechanism

The ciliospinal reflex is initiated by pain or touch stimuli to the neck, face, or upper trunk. The sensory input is transmitted to the spinal cord via the dorsal root ganglion. This information is then relayed to the intermediolateral nucleus in the spinal cord, which sends signals to the superior cervical ganglion. The superior cervical ganglion then stimulates the dilator pupillae muscle to contract, resulting in dilation of the pupil.

Clinical significance

The ciliospinal reflex is used in clinical settings to assess the function of the sympathetic nervous system. It is particularly useful in patients with Horner's syndrome, a condition characterized by ptosis (drooping of the upper eyelid), miosis (constriction of the pupil), and anhydrosis (lack of sweating) on one side of the face. In patients with Horner's syndrome, the ciliospinal reflex may be absent or diminished.

See also

• Pupillary light reflex
• Oculocardiac reflex
• Corneal reflex