Ganglia, Sympathetic 4 Male 4 Pituitary Gland 4 Rats 4 Rats, Inbred Strains 4 T<inf>4</inf> 4 TSH 4 Thyroid Gland 4 Thyrotropin 4 animal experiment 4 autonomic nervous system 4 endocrine system 4 etiology 4 rat 4 superior cervical ganglion 4 thyroxine 4 Animal 2 Animals 2 Compensatory hypertrophy 2 Female 2 Hyperplasia 2 Hypophysectomy 2 Hypothalamus 2 Norepinephrine 2 Pineal Gland 2 Pineal gland 2 Pituitary gland 2 Rubidium 2 Superior cervical ganglion 2 Support, Non-U.S. Gov't 2