What is the cutaneous Trunci reflex?

Cutaneous trunci reflex (panniculus reflex) – this reflex is used to help localize a spinal cord lesion. This reflex is evaluated by pinching the skin just lateral to the vertebral spines bilaterally, often with your fingers in a firm manner or hemostat. A positive response is seen by a skin twitch.

Which muscle is responsible for the panniculus reflex?

Cutaneous Trunci Reflex (Panniculus Reflex) This reflex causes contraction of the cutaneous trunci muscle and is elicited by pinching or pricking the skin of the trunk between T2 and L6–7.

Where is the cutaneous Trunci muscle?

The cutaneous trunci muscle (CTM) comprises a thin muscular sheath beneath the skin of the thorax and abdomen.

Which muscle is remnant of panniculus carnosus?

It is a layer of striated muscle deep to the panniculus adiposus. In humans the platysma muscle of the neck, palmaris brevis in the hand, and the dartos muscle in the scrotum are described as a discrete muscle of the panniculus carnosus.

How is the Panniculus response tested?

The panniculus reflex or cutaneous trunci reflex also relies on a reflex arc. This test is performed by applying stimuli to both sides of the body starting caudally at the wing of the ileum to the cranial thoracic area (at the T2 level).

What is the panniculus?

Panniculus, often incorrectly referred to as pannus, is a medical term describing a dense layer of fatty tissue, consisting of excess subcutaneous fat within the lower abdominal region.

What does panniculus carnosus meaning?

In mammal: Muscles. The panniculus carnosus is a sheath of dermal (skin) muscle, developed in many mammals, that allows the movement of the skin independent of the movement of deeper muscle masses.

Do humans have panniculus carnosus?

panniculus carnosus in higher primates, but it is less pronounced in apes than in Old and New World Monkeys and entirely absent in humans. The three pectoral muscles in primates also show considerable variability. In general the m. pectoralis major is the equivalent of m.

How is the panniculus response tested?

What is cutaneous trunci muscle?

The cutaneous trunci muscle (CTM) is a thin but extensive sheet of skeletal muscle that covers most of the dorsal and lateral walls of the abdomen and thorax. The afferent input to the CTM reflex is provided by the cutaneous branches of spinal nerves that supply the skin of the thorax and abdomen. Click to see full answer.

What is the panniculus adiposus?

Deep to the dermis is the panniculus adiposus (hypodermis or subcutis), a layer of adipose and loose connective tissue which connects the skin to the underlying panniculus carnosus muscle (Wingerd and Stein, 1988 ).

What is the trunci reflex?

The cutaneous trunci reflex (sometimes called the panniculus reflex) is a relatively complex reflex elicited by applying a noxious stimulus to the skin, which stimulates the superficial spinal nerves innervating a particular region or autonomous zone (dermatome) of the dermis and elicits a motor response, which is seen as a skin twitch.

What is the pathophysiology of panniculitis (panniculus)?

The panniculus is commonly involved as an extension of dermal inflammatory process, especially of suppurative and granulomatous dermatoses (Fig. 2-84 ). Likewise, there is usually some deep dermal involvement in virtually all panniculitides. FIGURE 2-84. Panniculitis in sterile idiopathic panniculitis.