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The fibrous sac of tissue that encloses the heart is the pericardium. It provides protection for the heart.
The ericardium is the fluid filled sac that surrounds the heart and keeps it contained inside the chest.
The Amniotic Sac.
endoplasmic reticulum
The lung is enclosed by a thin memrane called pleura
The amniotic sac is the sac in which the fetus develops in amniotes. Its wall is the amnion, the inner of the two fetal membranes. It encloses the amniotic cavity and the embryo.
"Yoke sack" comes from the term "yolk sac," and is a membrane that encloses the yolk of an egg.
The pericardium is the sac surrounding the frog's heart.
Flattening of the Dural sac is something that can be observed in patients who suffer from muscular atrophy of distal upper extremities. This means the Dural sac that encloses the spine is restricted and could cause many different things.
The term for puncturing the heart is cardiocentesis.
The Ventral Thecal Sac encloses the spinal cord and the nerve endings of the lumbar regions thecal sac (cauda equina) and serves as a protection for both and for the entire lumbar spinal region. The ventral thecal sac contains cerebral spinal fluid and it also serves as a buffer for the cauda equina.
The sac is called the pericardial sac. The snake's heart can move 1 to 1 1/2 inches because of this sac.