This is a Craniostat which is used to measure the size of the cranium. This device is replaced by neuroimaging in order to prepare for neurosurgery! Thickness and diameter of the skull varies by age and sex so knowing this data helps neurosurgeons perform surgeries without damaging the brain itself from @ryanmatthewcohn #anatomy #anatomical #museums #evolution #medicalhistory #ryanandregina #craniostat #premed #medstudent #nurse #doctor #neurosurgery #neurology #surgery #surgeon